Tim Robbins may have a role in Iron Man 2 as...

... Howard Stark, tony Starks father. So thats pretty interesting. Latinoreview got thew scoop from one of their sources and here is what they had to say:

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.

So there you have it. It is a rumor for now. But! A believable one. There are also other rumors floating around that Black Widow and Hawkeye will have significant roles in the plot. Take this information and do what you will it. Whatever ends up happening I am still totally stoked about 'Iron Man 2'!