'Iron Man 3' began filming this month yet we're still finding out about more actors who are appearing on set. Yesterday Jon Favreau revealed that he'll be reprising his role as Happy Hogan in the sequel. Today? Some information that just might be a bit cooler.

Latino Review just broke the news that actor William Sadler, best known for his roles in 'Die Hard 2' and 'The Shawshank Redemption,' was spotted on set alongside Guy Pearce getting fitted for a costume. But the question is, who is he playing? If we were to figure that his character is connected to Guy Pearce's character Dr. Aldrich Killian in some way, then that means more than likely he is also connected to the Extremis project. Maybe he's the test subject to the Extremis injection? Maybe he's another scientist who's working on the project?

Along with that, LR is reporting that there are a couple of extra screenwriters on set that will be helping Shane Black out when it comes to Robert Downey Jr.'s famous improvisation. He's been doing this for awhile so that part doesn't come off as a surprise.

'Iron Man 3' is already dealing with the Mandarin, Coldblood and Firepower all tied up around the Extremis story line. It's safe to say that Tony Stark/Iron Man definitely has his work cut out for him in this set of battles.

'Iron Man 3' will be released in theaters on May 3, 2013.