L4D2 Add-On "The Passing" features L4D1 cast and a lot more

[Omega Amen]

News has just been released: http://www.joystiq.com/2009/12/14/left-4-dead-2-dlc-the-passing-to-feature-l4d1-cast/

In addition to a co-op campaign (set in rural Georgia) and a new "co-operative challenge mode of play," The Passing will offer new content for Survival, Versus and Scavenge modes. You can also expect to encounter a new melee weapon, firearm and "uncommon common" zombie.

Date is early 2010. Pumped up for this.