I'm really interested in FF XIII-2. From what I've seen, the game looks much better than XIII, which I still enjoyed despite its numerous flaws. If XIII-2 is any good, I wouldn't mind a third game, as I really like the characters and the universe.
As for those complaining about Versus. The game isn't even done by the same team. So I don't see why this is supposed to be related. Complain about Nomura, not Kitase.