Left 4 Dead 2 Gets New Update and Free Weekend

A post on Steam announces the new The Last Stand update is now available for Left 4 Dead 2, which is a community created add-on for the co-op zombie shooter. The post has very lengthy patch notes, which also show bug fixes and quality of life improvements. It also points the way to this page where there are still more details. To celebrate the occasion, Left 4 Dead 2 is free to play through the weekend on Steam, and the game is on sale for 80% off. This post tries to sum everything up:
Take a Stand in This Massive Community-Made Update
Years in the making, The Last Stand is a massive Left 4 Dead 2 update created entirely by the L4D community. Find your friends, dust off your guns, and face the zombie horde one last time in over twenty new Survival Arenas, four Scavenge Arenas and a Campaign based on The Lighthouse Survival map.
New achievements, melee weapons, animations, dialog, competitive balance adjustments and other surprises await anyone brave enough to take a stand.

The Last Stand Expanded Campaign

The Last Stand is a brand new campaign based on the original Survival map—it’s no longer impossible to escape. But it won’t be easy. Originally a no-win death trap, the lighthouse now offers a path to salvation. Unfortunately, it’s directly through hordes of bloodthirsty infected.

Try to Survive
26 New Survival Maps

How long can you withstand the onslaught of the undead in 26 all-new environments?

Fuel Crisis
Get Gassed in Four New Scavenge Arenas

When a generator is your lifeline, the gas prices can truly skyrocket. Outlast your opponents by scavenging for fuel, or be overwhelmed by the horde.

A Pitched Battle
Plus a Shoveled Battle

Introducing the shovel and pitchfork—these centuries-old farming technologies make their proud debut on the zombie killing fields as all-new melee weapons.

But it Doesn't Stop There…
We Told You This Update is Massive!

  • New Animations
  • Official implementation of Counter-Strike: Source weapons in all servers
  • Formerly unused dialogue now restored in game
  • PVP enhancements and fixes
  • Versus Survival added to the Main Menu
  • L4D1 Common Infected models with gore
  • New Mutations: Rocketdude and Tank Run
  • UI Improvements
  • A TON of bug and exploit fixes