Other new characters that showed up include The Black Widow/Natasha Romanoff played by Scarlett Johansson and War Machine played by Don Cheadle, although technically James Rhodes is not a newbie.
1. Tony Stark is a hoot and a half! Robert Downey Jr seems to play himself in this one... although, his most recent work are all almost exactly the same. Wry, sarcastic, self-deprecating charming guy... :P
Other than that, it was a good summer outing and a good sequel to a good movie. :)