I just posted some details on the patch in the PC tech support forum.
This patch addresses some of the lag issues people have been reporting. There were also some more minor issues addressed. We'll be releasing another PC patch very soon, so don't get too worried about the short list of fixed issues.
Remember, we're working on updates/patches for both the PC and Xbox right now, and the lag issue was our biggest focus for both.
Iron Chef Chen
Breach Communications Team
No bastard ever won a war by dying for his country. He won it by making the other poor dumb bastard die for his country.
George S. Patton