Its been speculated on already of course, and many people feel its highly likely since Stark(RDJ) made an appearance in Edward Norton's Incredible Hulk movie. But this is the first solid...well,..rumor..sent from a reliable(at least according to nukethefridge) source that we have seen.
The sites confidential source first reported that Stan Lee will make a brief appearance in the second Iron Man film as Larry King. Now the mysterious scooper is reporting that that Edward Norton will have a possible cameo as both Bruce Banner and the Hulk.
Take it all with a pinch of salt of course!..But wouldn't it be great if this one turned out to be true?