Steam News has word on a new automatic update for Left 4 Dead 2 and the Left 4 Dead 2 SDK enabling PZ bots and implementing map fixes among other changes. There's also a fix for cheaters quitting before the vote to kick them would succeed, and word that VAC banned users can now play L4D2 single-player, commentary mode and credits. The complete change list follows.

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