It is unclear, whether Matt Damon will reprise his role of Jason Bourne. Damon has said that he would only want to make another film, if Paul Greengrass would direct it again, but he, previously, ruled out making further installments in the spy franchise. Greengrass also helmed 'Supremacy' and 'Ultimatum', and the two also worked together on 'Green Zone'.
Still, the movie will be made with or without them. Tony Gilroy, "keeper of the Bourne flame", as producer Frank Marshall calls him, is also a director. He has already directed 'Michael Clayton', starring George Clooney and 'Duplicity' with Clive Owen and Julia Roberts. So who knows, the solution may turn out to be very close!