Michael will be back on Lost!

There is an article on Entertainment Weekly (click here) that states that Michael will be back on Lost this next season. Will Walt also be back? The young boy is getting pretty old to be playing in their time frame. Why will Michael be back? He was last seen sailing away with Walt. Will he come back to be a hero and try to rescue his friends? Will he come back having been deluded by the "Others?" Will he come back as he can't physcially get away from the island a la Desmond? I'm intrigued. Only 4 or 5 more months left until Lost is back . . . I can't wait!