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.
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.