The snippet below is said to come from a Disney newsletter that has now been updated without this statement. I honestly see no reason for a new Epic Mickey not to be released.

“Disney Epic Mickey 2 is the latest game in the critically acclaimed Disney Epic Mickey videogame series. In this all-new action-platforming game available for Xbox 360, PlayStation 3, and Wii, Mickey embarks on an epic journey and is pulled back into a world filled with Disney’s forgotten characters. Players can choose to play single-player as Mickey or for the first time players can also choose 2-player split screen mode. In the 2 player mode one person can play as Mickey wielding magic paint and paint thinner to dynamically change the world and the second player can play as Oswald the Lucky Rabbit – Walt Disney’s first cartoon star – with the power to fly like a helicopter and use electricity to fight or friend enemies and solve challenges. Team-up and choose your path to save this forgotten world because the choices you make will alter the story and change the end of the game!”