Steam News announces the promised free weekend is now underway in Killing Floor 2, offering the chance to check out the new Incinerate N' Detonate content in the shooter, and entails some cross-promotion as well. Here's word on the plan:

In celebration of the "Incinerate N' Detonate" free content pack release, play Killing Floor 2 for FREE starting now through Sunday at 1PM Pacific Time. You can also pickup Killing Floor 2 at 33% off the regular price!*

Plus, check out the "Killing Floor 2 + Chivalry: Let's get Medi-EVIL" promotion!
Owners of Chivalry will receive a Knight Character and Sword weapon in Killing Floor 2
Owners of Killing Floor 2 will receive KF2 themed items in Chivalry
Current and new owners of these titles will receive this offer.

If you already have Steam installed, click here to install or play Killing Floor 2. If you don't have Steam, you can download it here.

*Killing Floor 2 discount ends Monday at 10AM Pacific Time. Chivalry discount ends September 14th at 10am pacific.