Well, it seems like Jessica Chastain (THE TREE OF LIFE, THE HELP) maybe joining the gang on IRON MAN 3. Deadline is reporting that the actress is in final talks to play "a sexy scientist every bit as smart as Tony Stark." The thinking is that the scientist is Maya Hansen, the creator of Extremis (a nanotechnology serum in an attempt to recreate the Super-Soldier serum).
This is on the heels of Guy Pierce and Ben Kingsley joining the cast. Robert Downey Jr., Gwyneth Paltrow, Don Cheadle and Scarlett Johansson are all coming back and shooting begins in May. IRON MAN 3, directed by Shane Black, will be released on May 3, 2013.