The Steam listing for Middle-earth: Shadow of Mordor now offers system specifications for Monolith's upcoming Tolkienesque action/adventure (thanks Polygon). Here's word: :

Minimum:
OS: 64-bit: Vista, Win 7, Win 8
Processor: Intel Core i5-750, 2.67 GHz | AMD Phenom II X4 965, 3.4 GHz
Memory: 4 GB RAM
Graphics: NVIDIA GeForce GTX 560 | AMD Radeon HD 6950
DirectX: Version 11
Network: Broadband Internet connection
Hard Drive: 25 GB available space

Recommended:
OS: 64-bit: Win 7, Win 8
Processor: Intel Core i7-3770, 3.4 GHz | AMD FX-8350, 4.0 GHz
Memory: 8 GB RAM
Graphics: NVIDIA GeForce GTX 670 | AMD Radeon HD 7970
DirectX: Version 11
Network: Broadband Internet connection
Hard Drive: 40 GB available space