According to The Hollywood Reporter, David Fincher is no longer directing Aaron Sorkin's really weird but awesome sounding Steve Jobs script, apparently due to "aggressive demands for compensation and control." That is very Fincher of him. Specifically, Fincher wanted $10 million upfront as well as an abnormal amount of control over promotional materials.
Sorkin's script kind of adapts Walter Isaacson's Steve Jobs biography by focusing only on three particular points in the man's life. So it's going to be a strange movie regardless of who directs it. A lot of people seem to be happy Fincher's out even though this would have been a Social Network reunion of sorts.
I'm sort of bummed out by the news, though I imagine a lot of other directors can do something great with the material. They'll have to.