Comic Book Resources caught some of the Q&A with Marvel Comics editor-in-chief Joe Quesada at New York's Comic-Con who gave an update on The First Avenger: Captain America:

I've seen a couple of outlines and an initial screenplay, and it's going to rock everyone's socks off," Quesada said. "It's very unexpected, the kind of movie it is." He added that "Captain America" sets up The Avengers in "a fantastic way" and also mentioned that there is an undisclosed wish list of actors to play the superhero.
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The Joe Johnston-directed comic book adaptation stars Samuel L. Jackson. Paramount and Marvel Studios have set a July 22, 2011 release date. The Avengers will hit theaters May 4th, 2012.