Illu, the HD remakes, are grouped as follows: HD Remake 1: KH1 Final Mix, KH:CoM, with scenes from 358/2 days, and HD remake 2 will include most likely KH2 and DDD. I don't personally believe they would include BBS simply because its more of a prequel, and I think these HD remakes are made for those who want the story thus far. BUT then again, I could be totally off. 8D (I usually am)
EDIT: I say that because of how I perceive this timeline:
Clicky Clicky!
That being said, it's been stated somewhere (I can't remember where, sorry, so I MIGHT be incorrect) that they will be for PS3.
HOWEVER if you're getting a PS4, there's a program/app/whatever called Gaikai that will be availabe on PS4 which allows purchase and streaming of PS3 games, so that shouldn't be an issue, honestly. (I was stressin' bout that too, honestly.)
But yeah the HD remakes have been in the works for a while now. o3o
That being said I sooooo wish I had a PS3 cause I'd definitely preorder. I want that art book baaaaaaad. ;3;
ANYWAY.
As for KH3 I am horrible with speculation so I'll just hold out til I hear some more news. xD
Illu and Xros, aside from story related things, what worlds would you like to see this time around? c: I listed mine earlier.