Testing is going to start soon. Until then, there is no answer. [ob die vorhandenen Player die TL-Scheiben abspielen können]
Please keep in mind that just because the format gets approved, it doesn't mean it gets used. So if TL-51 is not compatible with current players, the studios may choose to not adopt it and its applications will remain for specialized situations where this doesn't matter.
Then there are in between scenarios such as getting 34 gigabyte HD DVDs (two layers out of three in TL-51). Or having two layers compatible and the third layer holding things that don't matter (PC software, portable video, etc.).
Last but not least, let me say that the interest in forums around TL-51 is about 100X of the people in the HD DVD industry . Of course, if TL-51 proves fully compatible, this may change. But for most of us, TL-51 is a non-event. No different than how an Honda owner thinks wrt to Honda racing. It is cool if Toshiba can pull it off. But nothing in our strategy relies on it existing.