Stan Lee has made an appearance in most of the Marvel movies based on comics he created, but typically they are blink-and-miss cameos such as "Milwaukee Man Drinking from a Bottle" in The Incredible Hulk or "Man Dodging Debris" in Spider-Man 2. Iron Man 2 will see Lee step up his game by playing CNN Host Larry King.
Sources have split on what Lee's scene entails. Lee's scene could have him, as King, interviewing Tony Stark (Robert Downey Jr.) about his new, "black" Iron Man suit. Or, as told to Collider, Lee will be asking Downey Jr. when he will appear on the Larry King show. Perhaps they are both right, which would double the usual Lee screen time.
Iron Man 2's May 7, 2010, will reveal the truth, but until then, enjoy Lee's cameos of old in the video below: