After three Bourne films starring Matt Damon in the title role, Jeremy Renner takes over the reins of the franchise in The Bourne Legacy. Although his character- Aaron Cross- doesn't know Jason Bourne, the two characters are very similar. They were both involved in a secret government project that the CIA is eager to hide from the public at large.
Damon has served as the face of the franchise, so it will be interesting to see if Renner will live up to expectations and prolong the series. If he succeeds, and a fifth film is made, it's possible that Damon will join Renner in that new chapter.
If you're interested to see Renner try to pull off the main role, check out the film's trailer for a preview of the action.