GTA movie is impossible, thanks to Ron Howard
According to this Deadline Hollywood Daily piece, a GTA movie will never happen because of a 1977 movie of the same name
The Ron Howard film is said to be the source of a legal settlement in which Rockstar supposedly agreed to never make a Grand Theft Auto film as long as Fox never makes a video game based on Howard's work.
More through the link. Thanks, Shacknews.