Personally, I dont want there to be a KH3. KH was awesome, KH:CoM was awesome, and I'm sure KH2 will be awesome, but I just think it would be going too far to stretch into a KH3.
Some people say "Well of course there should be a KH3, it should be a trilogy." I dont know if those people noticed, but if they dont put in KH3, it will still be a trilogy.
Part 1 = KH
Part 2 = KH:CoM
Part 3 = KH2
That's 3 parts. 3 parts = a trilogy.
Also, for those of you who are saying it will be preview of the next game/movie/whatever, because ASAS and DD were, that's not true. ASAS and DD were not previews, or trailers, or sneak peeks or anything like that. They were just fun lil movies, that the developers thought would be a cool lil treat for gamers who finished up everything in KH.
I think there should be a secret movie, but it should just be a big finale kinda thing.