My belief is that if Returns is anywhere near succesfull Singer will give it a shot at a sequel, if not finally see through the trilogy that he didn't with X-Men. That being said I think Peter Jackson or Steven Spielberg are best suited for the job, and I would love to see it. However, my sleeper would be M. Night for a variety of reasons: 1) He was offered the job previously and would have excepted if they let him write his own script. 2) He loves the character of Superman and has since a child. 3) I love his take on the superhero genre with his work on Unbreakable.