Zur Info:
Ich habe zwar keine offizielle Quellenangabe, aber es sieht doch schon recht offiziell aus
.
"Items
General
Basic Stat Valuations have Changed - This means that the amount of statistics you get per point of gold has shifted.
Attack Damage is generally cheaper from 5 to 10% across all items.
Attack Speed is generally around 10 to 20% more expensive than before.
Armor and Magic Resistance is generally around 10 to 20% more expensive than before
Many items have had their statistics slightly adjusted around this fact.
In general, high-end item premiums have been reduced across the board. This means that items are generally more expensive or provide less statistics the higher tier they are.
Offensive Auras
Range increased to 700 from 600 - Abyssal Scepter, Frozen Heart.
Defensive Aurask
Ranges are now consistent at 1100 - Aegis of the Legion, etc.
Penetration
Flat Penetration items have had their values reduced.
Percent Penetration items have had their values reduced.
Slowing Effects
Global Slow particle now appears faster
Slow effects on Phage / Trinity Force now have reduced effect when used by ranged characters.
Slow durations on Phage / Trinity Force / Frozen Mallet reduced slightly.
General (Boots)
Movement Speed
Boots give 25 less movement speed across the board.
All champions have had their base movement speed increased by 25.
Tier 2 boots can be enchanted, upgrading them to a Tier 3 boot for some gold.
Homeguard: Provides powerful regeneration and movement speed at fountain.
Furor: Increased movement speed in combat.
Captain: Increases movement speed of allies moving toward you.
Distortion: Decreases cooldown of Ghost, Teleport and Flash.
Alacrity: Grants a small additional base movement speed bonus.
Removed
The following items are no longer available and items that built out of them have had their recipes changed:
Meki Pendant, Regrowth Pendant, Force of Nature, Ionic Spark, Moonflair Spellblade, Cloak and Dagger, Elixir of Agility, Leviathan.
The following items are no longer available on Summoner's Rift and items that built out of them have had their recipes changed:
Heart of Gold
Reworked
Doran's Items
Doran's items have slightly less statistics but each has gained an additional passive
Doran's Blade
Has 0% Life Steal
Passive: Recovers a small amount of life on hit
Doran's Ring
Lost a little bit of regeneration.
Passive: Gain a small amount of mana on kill.
Doran's Shield
Lost some health regeneration and armor.
Unique Passive: Blocks a small amount of damage from champion basic attacks.
Giant's Belt
Slightly cheaper but grants less health.
Rageblade
Reworked to have a powerful attack speed, spell vamp and life steal boost when you are low on life.
Aegis of the Legion
Lost attack damage, gained health regeneration
Builds out of Emblem of Valor instead of Ruby Crystal.
Lich Bane
No longer grants magic resistance.
Now deals magic damage equal to a base damage plus a percentage of your AP ratio.
Vamp Scepter
Now builds out of a long sword and grants attack damage.
All items that build out of Vamp Scepter now grants attack damage.
Zeke's Herald
No longer grants attack speed or builds out of a dagger.
Avarice Blade
Gives less critical strike
Grants an additional 2 gold per kill.
Hextech Gunblade
Active has had its base damage reduced and now has an AP ratio.
Single target attacks and spells versus champions reduce the cooldown of the active by 3 seconds.
Phantom Dancer
Grants less move speed and less attack speed.
Grants 'Ignore Unit Collision' passively.
Shurelya's Reverie
Grants far less regeneration statistics total.
Eleisa's Miracle
Does not grant Tenacity
Lowers Heal, Clairvoyance and Revive cooldowns by 20%
Gaining 3 levels with the item gives you the stats and passive permanently and the item disappears from your inventory.
Black Cleaver
Remade
Builds out of Brutalizer + other items
Dealing Physical damage reduces a % of the target's armor.
Youmu's Ghostblade
Active simplified - 6 for melee, 4 for ranged.
Active cooldown reduced to 45 from 60.
Warmog's Armor
Stacking passive removed.
Now regenerates 1.5% of your maximum health every 5 seconds.
Deathfire's Grasp
Remade
Now builds out of Needlessly Large Rod and an Amplifying Tome.\
Grants large amounts of AP and CDR%.
Unique Active: Deals 15% of the target's maximum health and amplifies magic damage done to the target by 20% for 4 seconds.
Warden's Mail
Recipe: Cloth Armor + Cloth Armor
Passive no longer random - but the effects are reduced.
No longer grants regeneration.
Warden's mail only reduces attack speed.
Builds into Frozen Heart.
Randuin's Omen
Passive no longer random - but the effects are reduced.
Randuin's Omen will reduce attack speed and movement speed.
Base duration on active increased to 2 seconds from 1.
Tears of the Goddess
Slightly cheaper
Now triggers when you spend mana as well as spellcasts.
Archangel's Staff
Upgrades into Seraph's Embrace when the Tears of the Goddess passive is fully charge.
Seraph's Embrace
Activate to shield yourself for 25% of your current mana for 2.5 seconds.
Manamune
Upgrades into Muramana when the Tears of the Goddess passive is fully charged.
Muramana
Toggle to deal a % of your current mana in magic damage on basic attacks and spells.
Tiamat
Melee only
Now a Unique Passive with a larger splash radius and damage falloff near the edge.
Now has an active: Activate to cleave in a large area around your target.
Consumables
Oracle Elixir
Duration capped at 5 minutes.
Elixir of Strength
Duration reduced to 3 minutes
Slightly stronger effect at early levels.
Elixir of Brilliance
Duration reduced to 3 minutes.
Slightly stronger effect at early levels.
New Items
Kage's Last Breath
Supportive Peel/Initiation Item
Recipe: Kage's Lucky Pick, Mana Manipulator
Keeps G/10 Passive.
Active: Target ally gets a 30% slow aura for 3 seconds - 60 second cooldown.
Liandry's Lament
Controlled Burn Mage Item
Recipe*:* Haunting Guise, Amplifying Tome
Passive: Dealing spell damage burns enemies for a % of their current life over 3 seconds. This effect deals double damage if the target's movement is impaired.
Statikk Shiv
High Speed / Burst Damage Item
Recipe*:* Zeal, Avarice Blade
Passive: Moving or Attacking builds static charges. At 100 charges, your next attack unleashes all charges to deal 100 magic to up to 4 targets. This effect benefits from critical strikes.
Frozen Fist
Resistance oriented version of Sheen
Recipe: Sheen + Glacial Shroud
Passive: After using an ability, your next attack deals physical damage equal to 125% of your base attack damage to surrounding enemies. This leaves an icy field that slows enemy movement speed by X% for Y seconds.
Bloody Hydra
High End Attack Damage / Area of Effect Item
Recipe: Tiamat + Vamp Scepter
Passive: Tiamat's active and passive now benefits from a percentage of your life steal.
Mercurial Scimitar
High End Magic Resistance / Attack Damage Item
Recipe: Quicksilver Sash + B.F. Sword
Active: Cleanses all debuffs from your character. If your character is melee, he gains 100% movement speed for 1 second.
Ohmwrecker
High End Siege Item
Recipe:Catalyst + Chain Vest
Active: Disables nearby enemy towers for 2.5 seconds, preventing them from attacking.
Wraith Collar
Supportive Scouting Item
Recipe: Kage's Pick + Null Magic Mantle
Active: Summons 2 wraiths for 6 seconds that seek the nearest enemy champions. If they reach an enemy champion, they slow him and reveal him for 2.5 seconds.
Hurricane
Ranged-Only Area of Effect Item
Recipe: Dagger + Recurve Bow + Dagger
Passive: Your shots fire two secondary ghostly bolts that deal X + 50% of your attack damage to nearby targets. These cannot critically strike but apply on-hit effects.
Zephyr
High End Speed Item
Recipe*:* Stinger + Long Sword
Grants Attack Speed, Cooldown Reduction, Movement Speed, Attack Speed and Tenacity.
Banner of Command
Siege Mage Item
Recipe: Blasting Wand + Emblem of Valor
Unique Aura: Grants health regeneration to nearby allies
Unique Aura: Grants % damage to nearby minions.
Active: Promotes a nearby siege minion to a super minion. You get all the gold from this minion's kills - 120 second cooldown.
Sword of the Divine
Rapid Burst Attack Damage Item
Recipe: Recurve Bow + Dagger
Active: You gain 100% attack speed and 100% critical strike for 4 seconds or 3 critical strikes - 25 second cooldown. This item gives no attack speed while on cooldown.
Passive: Kills and assists halve this item's cooldown.
Mikael's Crucible
High Tier Supportive Item
Recipe: Chalice + Sapphire Crystal
Passive: Increases mana regeneration based on missing mana.
Active: Removes stuns, roots, silences, slows, fears and taunts from an ally and then heals them for X + Y% of their missing health - 3 minute cooldown.
Consumables
Sight Stone
Supportive Ward Item
+X Health
Passive: Starts with 4 charges, charges refill when you go back to fountain.
Active: Consumes a charge to place a sight ward that lasts 3 minutes. You may have a maximum of 2 wards from the item at once
Ruby Sight Stone
Supportive Ward Item
Recipe*: Sight Stone* + Ruby Crystal
Passive: Starts with 5 charges, charges refill when you go back to fountain.
Active: Consumes a charge to place a sight ward that lasts 3 minutes. You may have a maximum of 3 wards from the item at once
Leaden Crystal Flask
Supportive Regeneration Item
Passive: Starts with 3 charges, charges refill when you go back to fountain.
Active: Consume a charge to regenerate 100 health and 40 mana over 10 seconds.
Jungle
General
Leashing has been changed
Jungle monsters now attack the closest hostile target rather than chasing their original target until reaching their range limit
Whenever jungle monsters switch targets it counts as a "leash" - the maximum amount of leashes after which jungle monsters will reset has been increased
Jungle monsters now deal bonus damage to summoned minions
Initial difficulty of all jungle camps has been increased
Overall camp Health has been increased
Camp difficulty and rewards have been re-distributed more into the large monster in each camp
The largest monsters at each camp are generally more resilient but also hold most of the rewards
Scaling difficulty and rewards of the primary jungle camps has been significantly increased
Health and Attack Damage growth per minute significantly increased
Gold and Experience growth per minute significantly increased
Overall rewards have been re-distributed between the 3 primary jungle camps (Wolves, Wraiths, Golems) to better match their difficulty and convenience
Wraiths are the fastest-respawning, most convenient camp and have the lowest rewards
Golems and Wolves are more difficult and are worth more
New jungle items have been added to the store and old jungle items have been adjusted
Hunter's Machete - new jungle starting item that builds into Madred's Razors and Spirit Stone
Spirit Stone - jungle item geared towards casters and tanks that has 3 upgrade paths
Madred's Razors and Wriggle's Lantern have been modified to build out of Hunter's Machete
The "Banking" system that caused jungle monsters that have stayed alive for a long duration to have slightly increased rewards has been removed
Wolves
Critical Strike damage bonus reduced to better normalize damage output
Movement Speed slightly reduced
Wraiths
Reduced their vulnerability from enemies that engage them from outside of the camp
Camp has been repositioned
Big Wraith's Attack Range has been reduced
Golems
Movement Speed and Attack Range increased to reduce vulnerability from kiting
Magic Resist reduced to negative values
Summoner Spells
Newly available
Barrier is now available on all maps to give players a selfish defensive option
Values rebalanced accordingly
Cooldown increased
Duration and damage absorbed reduced
Modified
Exhaust's values have been modified to reduce its impact on melee champs and increase its visibility
Physical damage reduction reduced, but now also reduces attack speed
Clairvoyance has been modified to focus more on hitting clairvoyance on players rather than zoning them out of an area
Improved clairvoyance now reveals champions hit by clairvoyance for the duration even if they walk out of the circle
Radius, duration, and cooldown modified as well
Clarity has been modified to restore mana based on mana pool rather than a flat value
Heal has been tuned to be a team supporting defensive option
Allies are now healed for the same amount as the caster
Health values and cooldown have been retuned accordingly
Flash, Ignite, and Revive have also had minor changes
Removed
Surge and Promote have been removed
Masteries
Masteries have been rebalanced
There are new additional mastery choices in all trees
Each Mastery Tree is now more accessible to all character types
Utility Tree has been improved
Summoner's Rift Map Layout
Removed the terrain blocking the ramps leading into the river near Dragon from the jungle for blue team and leading into the river near Baron Nashor's pit for purple team"
der typ ist einfach abnormal. 
