From CS.net: "I’m going to be in it," she confirmed to ComingSoon.net. "Paul Greengrass is going to direct it. Matt Damon and Joan Allen are going to be back too, and it’s going through so many incarnations of scripts. I think I was lucky to not die in the last one, but I just don’t know if I’m going to be good or bad."
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(Perhaps Jason Bourne could get the Stiles character pregnant, and then Part 4 could be called "The Unborn Identity.")