The Left 4 Dead Blog has word that the new automatic Left 4 Dead 2 update on Steam includes the encore of the Survival Versus mutation for the zombie shooter sequel. Here's word on that: "The first Survivor team sets the time. The second team tries to beat it. Then the first team tries to beat the second team's time. Then the second team tries to beat the first team's time. And then the... you get the idea. Rounds keep switching until someone fails to beat the previous time." They also offer the outcome of their poll on Tier 2 weapon placement:

The winner was to place Tier 2 weapons unpredictably in Map 2 followed by unpredictably placed in Map 1. After those two the rest are all distant runners muddled together.

So this makes it clear you want unpredictable tier 2 weapons when they are first available. We will try them on map 2 first and go from there. Remember, polls aren’t the final word. You never really know how something is going to work until you test it. We use this as a place to start testing and then react from further testing.