The guys at Tripwire have sent word that they're going to be doing another Killing Floor novelty map event, like they did for last Christmas, only this time it's a "Summer Sideshow". What that means is they've poured their mapping talents into creating a grotesque freakshow, complete with 'orrible circus variants of Killing Floor's hideous mutants, and new unlockables and achievements. You can check them out in the trailer below. More details on the site.
It'll be arriving on Steam, and the event will from June 30th to July 22nd. (Also I recall Killing Floor being a popular option for an RPS server. Any +1s to that?)