DICE recently announced that Battlefield 3 will not be released with modding tools. Patrick Soderlund went on record stating "if you look at the Frostbite engine, and how complex it is, it's going to be very difficult for people to mod the game, because of the nature of the set up levels [...]".
So PC users may be getting a nice graphical update, but this is more evidence that BF3 isn't necessarily being developed PC first. The last AAA release to drop modding tools, Dragon Age II, was a console port. News doesn't look good for PC shooter fans.