Updates to Left 4 Dead 2 have been released. The Versus updates will be coming to the Xbox 360 in the near future. For PC users, the updates will be applied automatically when your Steam client is restarted. The major changes include:

Addon Update
Fixed a crash when the vpk file limit was reached.
Fixed an issue where wireframes were displayed while playing Addon Campaigns.

Versus Updates
Added a 25 point scoring penalty for using a Defibrillator.
Scaled dynamic Defibrillators based on map length with a maximum of 1 per map.
Removed dynamic Pill conversion to First Aid Kits.
Removed Explosive Ammunition.
Increased Jockey damage per second.
Removed Jockey’s damage delay.
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