Well, to begin, the end credits of the 2.5 Remix actually shows footage from Dream Drop Distance. This is significant because the last HD Remix (1.5, duh) showed footage from all of the games that are currently in the 2.5 Remix.
This could be a huge hint that a Dream Drop Distance HD Remake is being planned, or possibly even worked on already. If I had to guess, I would say Kingdom Hearts Re:Dream Drop Distance has a nice ring to it, don’t you think?
But the even bigger news is the Secret Movie at the end of this installment. Of course, spoilers abound here, so watch at your own risk. Also, keep spoilers in the comments to a minimum, or mark them as such, please! Thanks!