You'll need to turn on youtube's captioning to see the subs. However, they seemed to have ditched Final Fantasy completely, assuming the trailer can be believed. But they instead brought in my favourite RPG ever!
Joshua, Neku, Shiki, Beat and Rhyme are all in there

There also looks like being a Tron area! Also, Riku as a main playable character, which is pretty nifty. There also looks like there are 'Dream Eaters' which you can capture and keep as pets, which will then be useful in the game somehow. I wasn't planning on buying a 3DS, but this and the new Layton game may be enough to convince me otherwise!