If you have L4D2, play through and survive the Cold Stream campaign today (July 6) and Valve will release Dead Air in L4D2 in a couple weeks. go go go go go go go go go go

What's Confirmed:

- Death Toll [L4D2]
- Dead Air [L4D2]
- Blood Harvest [L4D2]
- Cold Stream [L4D2, promoted custom campaign]

- Releasing after Portal 2, no date or estimate

http://www.l4d.com/blog/post.php?id=5019

For: BOTH Left 4 Dead and Left 4 Dead 2
Price: Free on Mac and PC, $7 on Xbox 360 (560 Martian Points)
Length: 3 Maps
Bonus: L4D2 owners will receive No Mercy in the update
When: October 5th, 2010

Source: http://www.pcgamer.com/2010/08/21/interview-valve-on-their-new-left-4-dead-dlc/

A replay will probably be organized in the week before the Sacrifice's release, in which Omzom members will be encouraged to form teams and take them through the five campaigns of the original Left 4 Dead, No Mercy through Blood Harvest. A list of participating teams will be kept updated as we near The Sacrifice's release date, leave a comment here or post in the Neogaf L4D2 thread with a summary of your squad and it will be duly added. If you go to the trouble of arranging a sacrifice beforehand, feel free to note that as well.

"Protect the gnome at all cost.
Do you crave attention? Want all the infected to swarm you and the gnome you are carrying? Then we have the game mode for you. The team needs to carry the garden gnome from start to finish in any campaign. The common infected hate the gnome and will swarm whoever is carrying him. Watch out putting him on the ground, a boomer explosion will send him flying!

This Mutation is available in Campaign Mode."

- L4D Blog

No, Rochelle is not in ♥♥♥♥♥ mode. This mutation is for Campaign mode, where everyone has temporary/pill health, so everyone's lifebars are constantly ticking down. There are no medkits, only pills and adrenaline. Let's give this mode some good playtime!

Next week's mutation is "Follow the Liter", which is probably the 'can only pick up 1 gas can at a time' scavenge mode.