While The Avengers movie is being filmed, we haven't seen any actual photos of the team in their costumes aside from their solo movies. However, Marvel has now shown the very first promotional poster showing the Avengers themselves - Chris Hemsworth as Thor, Chris Evans as Captain America, Mark Ruffalo as the Hulk, Jeremy Renner as Hawkeye, Scarlett Johansson as Black Widow and some CGI as Iron Man (unless they actually bothered to take a photo of Robert Downey Jr. in full costume for it, which I doubt). No Samuel L. Jackson as Nick Fury, though, although I'm sure we'll see plenty of him in the movie itself.
The poster is not meant to promote the movie per se, but rather licensing opportunities attached to the Avengers IP. We'll surely see more promotional materials actually targeted at viewers in due time. According to New York Times, Marvel is not certain yet whether they'll have an Avengers panel at next month's Comic-Con. Hopefully they'll show us something interesting.
We won't see the Avengers in theaters until May 4, 2012, almost a year from now. I can't wait to see the whole team assemble!
Source: The HD Room