Brawn has stated they have a total of not 2, but 3 front wings they have been playing with.
As for the rear wing, the beam wing is now angled more and is a full length beam wing opposed to before when it was cut in the center where the ending part of the chassis was located with the brake light housing.
The sidepods are substantially more skinny at the back end for a more vacuum packed appearance. There is a good before and after pic a couple pages back on this thread.