Ugly Betty's Santos joins the cast of Drive
Most television shows get a casting shake-up between the filming of the original pilot and, should the show get picked up, its eventual run. It happens for all kinds of reasons - networks don't like a certain actor in a role, scheduling conflicts, etc. In the case of Drive, characters are reportedly being taken in a "different direction."
There are a handful actors from the pilot who are being kept on - Melanie Lynskey, Emma Stone, Kristin Lehman and Rochelle Aytes. I guess the ladies weren't the problem. Once they manage to get the cast in place, the show's creative team will have to run the Fox scheduling gauntlet and get past the critics who, surprisingly, have yet to raise the point that the show's plot is essentially the same as Cannonball Run's.