The game isn`t even LISTED anywhere trustworthy at this point. It`s not on any of the official Nintendo Release lists, not listed on Square-Enix`s page, and only listed as "Release unknown" in Famitsu.
I have NO idea where this December number is coming from as no games are or have been scheduled for release on the 1st, let alone an FF. I can`t find anywhere with that date other than a "US" release on Gamefaqs, which is virtually unthinkable as I REALLY REALLY REALLY find it hard to believe that it would be released in the US at that date when the Japanese release isn`t even anywhere close. (If it was, Square-Enix would at the very least have a page up about it.
I think that someone, somewhere along the line totally screwed up their info. I wouldn`t expect this one to be released in the US for a while.