Spoiler Warning: Info on all four campaign themes.

[Lobster]

A member of http://www.left4dead411.com/ had a chance to play the game at his local game store and managed to bring some infomation on the settings of each of the 4 campaigns.

1. No Mercy - This is the streets and hospital campaign we have seen alot of.
2. Blood Harvest - Set mostly in the countryside via a trainyard, farms, barns, cornfields, etc.
3. Dead Air - City streets again, mostly rooftops with a large airport as the goal, the finalie takes place on a runway covered in plane wrecks.
4. Death Toll - Starts with a crashed vehicle on a country road, mostly woods, a small town and canyons, following the abandoned Highway seems to be the theme.

He also noted that each of the 5-map campaigns carries a movie poster style loading screen, with the name of each player printed as if they were the actors.

http://i162.photobucket.com/albums/t280/left4dead411/deathtoll-poster.jpg

 

[tschumann]

Here's some more info about the maps in the four campaigns:
No Mercy
The Apartments
The Subway
The Sewer
The Hospital
Rooftop Finale
Death Toll
The Turnpike
Dead Air
The Greenhouse
Blood Harvest
The Woods
The Farmhouse

 

[hool10]

Yeah I saw that too. He said there would be like shopping malls in Dead Air. Also a water treatment plant as well!?! Fortunately the way he described things are very vague and the pics he took are very blurry. Not much of a spoiler, just more hype. *Airport looks like some crazy LAX airport and is kinda claustrophobic by the looks of it.

 

[Omnomnick]

That sounds awesome, they've got some nice EP2 styled forest scenery by the look of things, should be good fun

Note: I like that kind of forest scenery

 

[tschumann]

I read that there's going to be a plane crash on the airport level (I think there might be some shaky camera shots of this somewhere). I hope it looks good.