I just completed KH2 in proud mode and it took 41hrs. :D Easter well spent!
My guess is that there will be 1 more game before KH3 after 3D. It explains more about the rest of Organization 13 members and they will all probably reborn in their human forms. While Sora and Riku have defeated the young Xehanort, the pure form appears in real world. Mickey, Goofy, Donald and Lea (probably with some other Org.13 members like Isa and Ienzo) have to do their best to slow him while Sora and Riku are trying to return from realm of sleep.
This game would most likely come on PS Vita, because it’s the final portable which doesn’t have a KH game yet. The Final KH3 would be released on PS3 as a HUGE game. What do you guys think?
Remember: This is only my opinion.