New L4D 2 campaign being presented at ComicCon [Wet wet wet]

You know they said there will be weather variations on the upcoming title, L4D 2? Remember?

We all were gazing at the sunset in the daylight maps footage we seen.
We also were told weather was gonna affect the infected. The witch will wander around when the sun is up, for example.

But what about rain? Well, from the picture above, it doesnt seem the infected are happy when the weather is bad.

I mean, who is anyway?!