In a recent post on the official blog of 2 Left 4 Dead, Valve said that the community is working on a new additional content planned for the game after the release of Portal 2 for Xbox 360 and PC. The real news will be represented by the fact that users of the forum to decide on improvements to the campaign, called "Cold Stream" and made by a famous modder, and create a credible story. For the occasion, PC users can play an early beta that will be continually modified until the final release that will be featured in Xbox 360 along with other content created by Valve.