It seems as if James Franco will not be reprising his role in any capacity for Fox's Dawn of the Planet of the Apes. It's hard to find this upsetting since I feel there were only really two important characters in Rise of the Planet of the Apes, and his was not one of them. In an interview with MTV Franco elaborated on the situation:
I guess the studio execs felt the same way as I did. To be fair, I feel a little bad for Franco, as I would think that someone somewhere would at least have the decency to let him know that he won't be needed for the sequel. At least he's still going on to do big things, and he'll still be working with simians, just of the flying variety.