Iceberg Interactive and Tripwire Interactive are pleased to announce the “Level Up” Free Content pack for Killing Floor. This massive new content pack will be the largest free content pack to date and will be available October 22nd for anyone that owns Killing Floor. To celebrate and to allow as many people as possible to try it out, in cooperation with Tripwire and Steam there will also be running a free weekend on Steam from Thursday October 22nd through Sunday October 25th. Full details on the pack will be available in a detailed preview article on IGN on Tuesday October 20th, so watch for that one.
Article from Gamersyndrome.com