While lurking around the internet, I have found a good amount of picture that involves the cast of the Avengers on set of the movie. I will say also, that Hawkeye's costume came out better than I thought, I mean look at it! It actually looks really good. The pictures also confirms a Stan Lee appearance.
I really like all the new costumes. Captain America had the biggest improvement. And Hawkeye's is really nice, but I wish they gave him a mask. Still nice though.