The most important thing as far as I'm concerned is the storyline. Always has been, always will be -- forums such as these wouldn't exist otherwise.
After playing games such as God of War and the Devil May Cry series, I'm beginning to expect more and more out of the action genre. An expectation level I personally don't think will be met by Kingdom Hearts II or any other potential future games in this series. ... If they manage all of that, though, I'd be quite impressed, not to mention how happy I'd be.
I think my only fear right now is that the supposed "second game curse" will rear it's ugly head again. Devil May Cry 2 and Xenosaga II were huge let downs in comparison to their originals, both of which I enjoyed for whatever reason. While the second games were somewhat ok on their own, they just didn't carry the same "feeling" or general depth -- something I feel is immeasurably important to this series. And while I realize COM is technically the second game, KHII will be the second game on a PlayStation.