Grasshopper Manufacture's Killer is Dead is coming to PC by way of Deep Silver, who will be publishing the Killer is Dead - Nightmare Edition for May release. That's May 9, 2014, to be more exact.
Killler is Dead - Nightmare Edition is expected to be come out with at $19.99 price tag, along with "exclusive content." What sort? For one, you'd be getting the new difficulty mode "Nightmare Mode," where enemies can only be killed with a handful of attacks, and players cannot rely on the Final Judgement finisher to off opponents. Additionally, Nightmare Edition will come with the Smooth Operator Pack DLC, unlocked after Episode 3, and a Theater Mode for rewatching cutscenes and accessing more character information.
Not too bad, right? Especially for $20. The game will be available both through retail and online as a download.
Nightmare Mode - YouTube