its been annouced to be released only in Japan, SO FAR.

hopefully they'll release it in the us.

here's some of the new stuff with it:

-there will be a NEW difficultly mode(called critical mode)
-Brand new cutscenes in both Roxas and Sora's storyline
-a new combat setting
-brand new bosses that features a battle with Roxas vs Riku(Xerenort's heartless).
you can fight the Organization from KH:COM(which is much harder than Sephiroth)and if you really wanted to face Roxas as Sora,this game is your big chance.
-new reation command.
-A new drive form for Sora which is called limit
-new heartless
-there are new area
-an Extended ending
-and this game will let you play a new version of KH:COM in 3D.

heres a vid:

Final mix

holy crap......if all that is in there, i will totally buy it over again!!!

Sadly it's probily going to be just like the first final mix and stuck in japan, except COM that might apear here.