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.

http://www.latinoreview.com/news/exclusive-scoop-the-player-may-join-stark-industries-5873