Список изменений в обновлении:

Client
*Removed an infinite ammo exploit for molotovs

Add-on Campaign Support
*Players download third party campaigns as single .VPK file
*Players can manage and select add-on maps and campaigns via game UI
*Added matchmaking support and download/update prompt for add-on campaigns
*Custom campaign support in Leader boards
*If not already registered, left4dead.exe registers .VPK extension to allow automatic install of add-ons
*Servers and the steam API have been extended to allow servers to send up a list of keys for matchmaking up to 1200 bytes in size

Left 4 Dead Authoring Tools
*Fixed missing fgd error
*Added vpk.exe command line tool for extracting, creating, and appending .VPK files
*Removed info_versus (not used)
*Added info_gamemode which fires outputs for Coop, Versus or Survival depending on what game mode the map is loaded in
*Updated tutorial_standards example map, repackaged as 'Dead Line' campaign example add-on
*Sample content now includes source files for official maps