The Steam page for Hatred is now online, an expected development of the game's greenlight, and DSOGaming notes this is the first Adults Only rated title sold on Valve's service. The listing also offers some system requirements, though they warn these may be subject to change:

MINIMUM:
OS: Windows® 7 (SP1) / Windows® 8 / Windows® 8.1 / (64-bit only)
Processor: 2.6 GHz Intel® Core™ i5-750 or 3.2 GHz AMD Phenom™ II X4 955
Memory: 4 GB RAM
Graphics: NVIDIA GeForce GTX 460 or AMD Radeon HD5850 (1 GB VRAM)
DirectX: Version 11
Hard Drive: 8 GB available space
Sound Card: DirectX-compatible
Additional Notes: Requirements may be changed in the future

RECOMMENDED:
OS: Windows® 7 (SP1) / Windows® 8 / Windows® 8.1 / (64-bit only)
Processor: 2.5 GHz Intel® Core™ i5-2400S or 4.0 GHz AMD FX-8350 or better
Memory: 8 GB RAM
Graphics: NVIDIA GeForce GTX 680 or AMD Radeon R9 290X or better (2 GB VRAM)
Hard Drive: 8 GB available space
Sound Card: DirectX-compatible
Additional Notes: Requirements may be changed in the future