That guy up there is Oswald the Rabbit, pictured in a limited edition cel from a 1920s animated short. According to a Eurogamer post that has apparently scooped Game Informer's carefully doled out online teasers, Oswald is the antagonist in Epic Mickey, the upcoming Mickey Mouse re-imagining for the Wii.

Epic Mickey is a tale about the 'forgotten' Disney stars: the rides, the characters, the lesser-known cartoons...This forgotten world is run by Oswald the Rabbit. He was Disney's first creation, made long before Mickey Mouse, and his jealousy of the newcomer has fermented for years. Now, finally, Oswald is ready for revenge.