Deadline reports that Tony Gilroy's Bourne Legacy is heating up as the first group of actors to test have been revealed. They include Joel Edgerton (The Thing, Animal Kingdom, Warrior, King Aurthur), Luke Evans (Three Musketeers, The Raven, Immortals), Garrett Hedlund (Tron Legacy, Troy) and Dominic Cooper (Captain America, An Education).
Joel and Luke are my favorites of this group. Cooper doesn't seem a good fit for the Bourne franchise. Garrett has been linked to other films like Akira and Daredevil so I'm not sure how interest he would be.