We're sort of putting a slightly different spin on Steve Rogers. He's a guy that wants to serve his country, but he's not a flag-waver. We're reinterpreting, sort of, what the comic book version of Steve Rogers was.
Casting Captain America is really casting two roles... Steve Rogers before and after the transformation from 98 pound weakling to perfect physical specimen. I can't divulge how we're going to do it, but the performance will be Chris Evans from beginning to end.