Finally an official trailer out. If they can't save they world, they'll avenge it. And hey, if you watch this, Hulk is indeed in this one played by Mark Ruffalo. Funny comment via the Youtube saying "powerful fart" by Johansson at 0:44, which happens to be the screenshot of the video. Can't play it? Click Here.
Anyway, you might also want to check out a couple of leaked images of the Avengers movie while it was being made.
The movie's bound to hit the cinemas by May 2012 - summer time here in the Philippines