This is some cool news, according to EW.com via SuperheroHype, The Avengers haven't finished, despite making over $200 million domestic, and over $600 worldwide. That's a lot of Hulk. Anyway, straight from Robert Downey Jr:
"We're actually not done shooting," he said. "We're shooting another scene tonight."
And here's a nice little discussion with all of the Avengers and Joss Whedon for EW.com: