Source: Deadline Hollywood
Tony Gilroy, the writer behind all three Jason Bourne films, will script the fourth installment: The Bourne Legacy. Unfortunately, Paul Greengrass has said he won't do a fourth film, and Matt Damon in turn said he won't work without Greengrass. Perhaps the involvement of Gilroy can persuade Greengrass and Damon to change their minds.
Since the Bourne series has always been compared to the James Bond films, perhaps Universal could simply put a new actor/director combo in place. The studio is eyeing a 2012 release.