This is seen prior to Captain America. If you want the post-movie teaser, go see the Captain in theatres. Also won't post it because it's quite shaky. [youtube]http://www.youtube.com/watch?v=GvL4iJy2PPw&feature=related[/youtube]
I'm excited about this movie. I've never read an Avengers comic or know anything about them, but Marvel movies are typically good, plus the idea of a bunch of superheros coming together seems cool.