Okay, so after reading everything, I get the impression that there just isn't much too do post story mode. The lack of the Coliseum tournaments/battles is extremely concerning and a strange omission, I have no idea why they'd choose to omit that. Also, having the data battles return would have been nice, that was the best part about KH2FM for me. I'm not too bothered with the story elements at the moment as I'll have to see it for myself, there's also the secret ending/epilogue. Overall, they really should have added another Disney world in there, anything would have been acceptable but the game does feel relatively short considering the wait. Also, the talk about how easy the game was and the continuous attraction flows are not good signs.
Regardless, I'm glad that I've had access to all these story leaks and gameplay spoilers, at least now when I play the game I won't be expecting loads of things like I did a couple of weeks ago. My expectations are extremely tamed now.
I'm expect them to make a Final Mix version that'll add a couple of secret bosses, coliseum battles, data battles (or something similar) and maybe even a couple more mini-games and/or keyblades and collectables.