The system requirements were published recently on the game’s Steam Community page.

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Here they are:

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

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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

Ground Zeroes and Metal Gear Solid V: The Phantom Pain. will support 4K, improved lighting and shadow resolution. Comment below.