The current issue of Total Film has an interview with Bryan Singer, in which he mentions wishing he'd returned to direct X-MEN: THE LAST STAND & states an interest in "possibly" taking a crack at X-MEN ORIGINS: MAGNETO.

I'm eternally intertwined with X-Men now. What takes an audience four hours to watch - the first two movies - took six years of my life. So, to not be part of it....It's a shame."

Asked whether he wished he had directed X-Men: The Last Stand, he admitted he had that feeling "before I was watching it, during watching it, after watching it."

Singer added: "It's weird for me to watch it, because I'm so close to the universe. And also Brett is a good friend of mine. But, of course, I would love to return to that universe."

And on the question of whether he might be interested in X-Men Origins: Magneto, he said: "Possibly. The only thing that concerns me about Magneto is that if the prequel were to follow the track I used in X-Men, which is Magneto's history in the concentration camp, then I've lived in that world.

http://www.aintitcool.com/node/41267