Hmm. Maybe they could've called it the "Kingdom Hearts: HD ReMIX Collection"?
Highly unlikely I'll go for it. Even with the promise of some new content, doesn't seem like there'll be much if anything to make me want to buy this again only a few years after last buying 2.5.
Think of it this way instead, it's Kingdom Hearts without the graphical glitches that the PS3 versions suffered from.