Microsoft just announced in their E3 Press Conference, Left 4 Dead 2. Coming November 17th on PC and XBox 360

L4D2 promises to set a new benchmark for co-operative action games and become one of 2009's marquee titles.

The game will introduce AI Director 2.0 taking L4D's dynamic gameplay to the next level by giving the Director the ability to procedurally change weather effects, world objects, and pathways in addition to tailoring the enemy population, effects, and sounds to match the players' performance.

         With the knowledge gained from creating the original, new technology, and a passionate team, L4D2 will set a new benchmark for cooperative action games.

The game will feature new Survivors, boss zombies, weapons, and melee combat with items such as a chainsaw, frying pan, axe, baseball bat, and more. Left 4 Dead 2 offers a much larger game than the original with more co-operative campaigns, more Versus campaigns, and maps for Survival mode available at launch.

Read the rest here: http://www.halflife2.net/2009/06/01/left-4-dead-2-announced/#more-3161

Teaser Trailer: http://www.youtube.com/watch?v=3XpzeK_YpGI&eurl#hq

Game Play Videos:   http://www.halflife2.net/2009/06/01/left-4-dead-2-gameplay-videos-rps-podcast/

New Orleans here we come.

More game play vids:  http://www.halflife2.net/2009/06/01/left-4-dead-2-gameplay-videos-rps-podcast/

Now I can't wait.

This is valve, it will be released in a decade or so.

Holy crap! A firm date?! *dies*

"Left A Little Longer 4 Dead"

"Left A Little Longer 4 Dead"

Still Left a Little Longer 4 Dead Again Also, Part 2
     SLLL4DAA P2
Sounds like a working title to me.

 
Part 3 can be:
Left 4 Maiming Earlier aka L4M3 *cough* LAME *cough*