It's not exactly the upcoming The First Avenger: Captain America; rather, 1990's horribly cheesy Captain America, starring Matt Salinger in the title role and directed by Albert Pyun.
The movie never saw a theatrical release in the U.S. but did find life on VHS. The movie still has no DVD release, but comic book fans in the U.S. can watch the entire movie courtesy of Hulu and see what director Joe Johnston shouldn't do with First Avenger: Captain America.
http://www.hulu.com/watch/116031/captain-america
Grab a couple sodas and some popcorn. Happy viewing!
(NB - The movie is for US residents only)