http://www.killingfloorthegame.com/
A $20 game, $15 if you preorder on Steam, oops is that forbidden on here?
From independent developer Tripwire Interactive, who created Red Orchestra: Ostfront 41-45
Let the "specimen" killing begin!
http://helldescent.com/killing-floor-interview/
http://news.filefront.com/gt-qa-tripwires-killing-floor/
Some interviews with some information about the game for those who never played the UT2004 Mod.