Iron Man 2 director Jon Favreau has posted an update on the sequel:
Rehearsals began today on Iron Man 2. Three weeks from shooting and my life is no longer my own. I forgot how overwhelming this process is.
Iron Man 2, starring Robert Downey Jr., Gwyneth Paltrow, Don Cheadle, Jon Favreau, Mickey Rourke, Sam Rockwell, Samuel L. Jackson and Scarlett Johansson, hits theaters on May 7, 2010.
Source: Jon Favreau