Despite it not always seeming like it, there actually is a pattern to the games released. I was looking at it, and there seems to be a missing spot for a future game.
MAIN side side MAIN side side MAIN side side MAIN
BBS bbsvol2 ???????? KH1 com days KH2 coded 3d KH3
i doubt there would be a bbs volume 3. but what else could be covered that takes place in that time period? Perhaps bbsvol2 would be about aqua, and the next one about the king? riku? xehanort? i really don't know. but i imagine a game will be made to fill that spot.