Well, the game is apparently called "Epic Mickey 2: The Power of Two". It will be released for PS3, Xbox 360 and Nintendo Wii. (Other Systems TBA.) It will contain co-op as well.
Also details about the game:
-Mickey/Oswald Co-op confirmed
-The game's writing will be something like a musical. (Y'know? Your typical random Disney singing moments.)
Also Interview with Warren Spector.
Plus the Wii versions box-art.
Also, a news article by CVG.
Expect more news with the upcoming issue of Nintendo Power.