I'm really excited this isn't just a rumor :D. This game is a complete 3D remake of the 2004 GBA KH game, Chain of Memories. The "Re" I think means "remake". Here's the link to Square's actual confromtion:

http://www.square-enix.com/na/company/press/2008/0919/

Here's Gamestop's story on it:

http://www.gamespot.com/news/6197934.html