Thanks to a post on the Metal Gear Solid V: Ground Zeroes Steam Community page, we now know the system requirements for the PC version of the game. Get ready. Are you ready? Good.
Minimum Specifications:
OS: Windows Vista 64-Bit or later
Processor: Core i5 SandyBridge 4Core (4 Thread) 2.7GHz or above
Memory: 4 GB RAM or above
Graphics: GeForce GTX 650 or above
DirectX: Version 11 or above

Recommended Specifications:
OS: Windows Vista 64-Bit or later
Processor: Core i5 SandyBridge 4Core (4 Thread) 2.7GHz or above
Memory: 8 GB RAM or above
Graphics: GeForce GTX 760 or above
DirectX: Version 11 or above

Well, those don't seem too bad at all actually.