Responding to a fan's email, Valve Software's Chet Faliszek has revealed that a Left 4 Dead patch should be hitting the web sometime this week. According to Chet, the patch will address a "whole class" of bugs/exploits, but he stops short of offering actual details on what's being fixed. He also notes that patches are independent from DLC updates. So while this is great news, it sounds like we may have to wait a little longer for new maps/bosses ect. We'll keep you posted! ;)
Thanks for the tip TracerTong.