The Steam page for Ryse: Son of Rome now reveals an October 10th release date for the Windows edition of Crytek's action game, offering a free copy of the game's soundtrack for those who pre-purchase it (thanks VG247). This also reveals the following system specifications:

Minimum:
OS: Windows Vista SP1, Windows 7 or Windows 8 (64bit)
Processor: Intel Dual-Core 2.8 GHz/ AMD Dual-Core 3.2 GHz or better
Memory: 4 GB RAM
Graphics: DirectX 11 graphics card with 1 GB video RAM
DirectX: Version 11
Hard Drive: 26 GB available space
Sound Card: DirectX compatible Sound Card with latest drivers

Recommended:
OS: Windows Vista SP1, Windows 7 or Windows 8 (64bit)
Processor: Intel Quad-Core or AMD Octo-Core
Memory: 8 GB RAM
Graphics: DirectX 11 graphics card with 4 GB video RAM
DirectX: Version 11
Hard Drive: 26 GB available space
Sound Card: DirectX compatible Sound Card with latest drivers