Mike from KHN has taken his time to visit the support section of Square Enix's North American website. He asked several Kingdom Hearts related questions and received the following answers:
"He told me that it was not coming out to North America or Europe. He also stated that all Final Mix games are just for Japan. It's very possible to have them here, but it may be years. So, now I'm slamming EGM (Electronic Gaming Monthly) rumors of a fall release for Kingdom Hearts II: Final Mix+. On top of that, he also told me that there are no KH projects confirmed, yet. Which means that a sequel is not going to be confirmed at least until TGS (Tokyo Game Show)."