I guess no need for long intros for this one. But the movie is set to play on May 4th, 2012, so we still have a lot of time to kill before we can see the Avengers Movie. Anyhow, the teaser trailer that was first shown on comic con is now available online, you can watch the trailer after the jump.
You can hear Samuel L. Jackson voice as Nick Fury.
Source: Avengers Trailer