Bit of Iron Man 2 casting news today as latinoreview is reporting that Tim Robbins will play Howard Stark in Iron Man two and two of the Avengers will show up the article states:
Tim Robbins is going to be playing Howard Stark in an important flashback sequence that is going to set up the Avengers and Captain America films. Jon [Favreau] wanted to get a good actor because he didn't think the guy who played Howard in the last film could carry such an important scene.
I'm also told that HAWKEYE and BLACK WIDOW are definitely in Iron Man 2 and they wont be cameos either.