The Left 4 Dead Survival Pack is now available for the PC and Xbox 360, free of charge to all owners of the game. The full change list for the PC release is below. In addition, both the retail and Steam versions of the game (PC and 360) are now available for a special price. Check Steam and local retailers for pricing details. For more information about L4D, please visit www.l4d.com
 
Survival Mode
– New gameplay Mode
– 16 maps including Last Stand
– Leaderboards
– 7 new achievements
 
Versus Changes
– Fixed a case where versus team score would continue to be recalculated after the
score panel was displayed
– Fixed an issue with recalculating the versus score health bonus for a player when
they are rescued from being incapacitated
– Fixed being able to start a swing as an infected, then teleport to the survivors
and have the claw swing hit a survivor
– Fixed a case where teleporting to the survivors would not reset the ability timer
– Fixed an exploit where you could load the chamber of a weapon with bullets by
holding down the melee key
– Fixed a case where it was not possible to join a game while it was in a finale
– Fixed a rare case where listen servers would speed up the game over time
– Removed convars related to melee fatigue
– Fixed a case where infected players would get a respawn time on their initial
spawn into a map
 
Server Changes
– Made ms_force_dedicated_server not require cheats
– Add a message when queuing a heartbeat
– Simplified setting of game mode. 
removed convars director_no_human_zombies and director_holdout_mode
added mp_gamemode [coop,versus,survival]
 
General
– Added lobby join and leave messages