Nomura and his team are still working on Final Fantasy Versus XIII, though he's said that they're looking into hardware options for Kingdom Hearts III.
If you're a fan of the series then you owe it to yourself to at least try out the handheld games if possible. Birth by Sleep was, IMO, the best in terms of combat thus far.
Quite. Birth by Sleep is my favorite in the series so far, actually, if only because it cleared up a lot of questions I had from the original series.
358days/2 was fun, its worth a play because it don't look like 3 is coming out anytime soon
Eh, 358/2 days was okay, considering it was made pretty much solely for the purpose of appeasing the fans of Organization 13. The plot really threw me for a loop though. It was a bit out there, even for Kingdom Hearts, and I'm already convinced that Nomura is on some sort of drug when he sits down to write the storyline.