My source in Bulgaria has checked in with some more information for us. He's reporting that an actress named Nan Yu has joined the cast and her character's name will be Maggie. Her supporting role should be rather substantial as it's believed she is shooting in both Bulgaria and China and will be filming scenes with Jet Li and his stunt double. I'll update you when I learn more!!
My source is also reporting that Arnold Schwarzenegger will shoot his part in 4 days, Bruce Willis in 5 days and Chuck Norris in 3 days. This I'm sure is subject to change but it does give us a better idea and update on how long they will be around. He still hasn't seen Mickey Rourke on set but actors are still arriving so we can't read too much into that just yet.