Edward Norton stayed cryptic when asked earlier about his possible appearance in The Avengers. But as to whether Norton's Hulk will make a cameo in Iron Man 2, Norton was less vague, telling MTV at the Toronto Film Festival that a Norton sighting is doubtful.
I heard that. I don't know where that's coming from. I am not in Iron Man 2 to my knowledge.
Norton still has yet to commit to star in The Incredible Hulk 2, but it's possible that Norton's giant CGI counterpart could alone appear.