Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Gameplay

    * Now ghost PZ's can never be staggered
    * Enabled PZ bots
    * PZ bots use their more aggressive survival mode behavior in versus and scavenge
    * Enabled finale manual spawn by default
    * Fixed human PZ players not getting counted when they were dead, allowing extra PZ bots to spawn
    * Reduced effectiveness of melee weapons against the Tank ( 5% of max health, from 10% )
    * Fixed a case where a player who dies, then is rescued from a rescue closet, and then is revived from a ledge hang receives the secondary weapon that he lost when he was initially killed
    * Improved SurvivorBot AI in cases where the bots refused to shoot through their teammates and became non-responsive
    * Fixed issue with witch sometimes taking on uncommon common properties
    * Fix for cheaters quitting before the vote to kick them would succeed and avoiding ban on server
    * VAC banned users can now play L4D2 single-player, commentary mode and credits


Map Fixes

    * Dark Carnival Fair Ground: added env_player_blocker to keep special infected from getting stuck
    * Dark Carnival Fair Ground: added navigation area that was missing
    * Dark Carnival Fair Ground: Disconnected drops that were blocked by the top of a fence
    * Swamp Fever Plank Country: Deleted 2 nav areas that connected between tree trunks you can't pass through
    * Swamp Fever Shanty Town: Redrew ladder thinner so special infected could climb up to the roof
    * The Parish Waterfront: Fixed various navigation areas
    * Mall: Tuned spawning for difficulty


SDK Content

    * Added missing nature/blend tooltextures added
    * Added missing cs models/textures
    * Added missing acunit01 model/texture
    * Added missing ammo_can_02 model/texture
    * Added missing patio_chair model/texture