There’s an update to Valve’s Linux blog today with some performance figures for Left4Dead 2, which will be the first game released with Steam for Linux when it arrives hopefully later this year. Apparently work is coming along on the project in leaps and bounds, with the Linux version of the game actually running faster than under Windows.
In a post on the Left 4 Dead blog Valve have announced that if 20,000 people earn the Stream Crosser achievement (for finishing the Cold Stream campaign) by next Sunday they'll release the Left 4 Dead 2 version of original Left 4 Dead campaign Dead Air early on July 22nd.
Valve are describing this an an extension of their usual testing process, where the whole company gets a chance to bug test a new game shortly before release and prizes are given out. Cold Stream has been developed publicly, so this time we get a taste of what the Valve testing process is like.