The pictures suggest that the only updates will be in those places, probably following similar updates to the 3 Series. In fact, it looks like the updates will be very mild, with little changing over the 2012 model year. BMW will move the turn signal indicators up onto the side mirrors, but the obvious updates stop there.
A revised interior seems likely, though the photos don’t lend much to that theory. The engine options should also remain the same unless there’s a surprise in store from the M division.