Honestly, Left 4 Dead 2 took Joystiq by surprise. Everyone at Joystiq HQ had rejected the rumors that were swirling before E3. Left 4 Dead wassn't even a year old, after all -- it was too soon for a sequel. This was especially true given Valve's reputation for supporting games like Team Fortress 2 with seemingly constant updates and upgrades. If anything, they were expecting an expansion for Left 4 Dead, some kind of DLC. Why should they have to buy a brand new game after only a year?
Thirty seconds into Left 4 Dead 2, they didn't care anymore. There were zombies to kill.