The once-console-exclusive hack-and-slash game KILLER IS DEAD is making its way to PC in an exclusive Nightmare Edition. The Nightmare Edition includes a new difficulty mode called Nightmare Mode, where enemies can only be defeated with three attacks: Adrenaline Burst, Dodge Burst, and Headshots. It also includes the Smooth Operator Pack of extra goodies, which had been a pre-order bonus with the console editions, as well as a Theater Mode that allows you to "rewatch cutscenes and get extended background information on characters."
KILLER IS DEAD - Nightmare Edition is set to release on May 9, 2014 for $19.99, in both retail and digital formats. While Steam was not mentioned specifically, knowing publisher Deep Silver's history, a Steam release should be a given.
Source: Press Release