Minimum Specs

OS
Minimum: Windows 7 SP1 with Platform Update for Windows 7 (64-bit versions only)
CPU
Minimum: Intel Core i5-2400 @ 3.1 GHz | AMD FX-6300 @ 3.5 GHz or better
RAM
Minimum: 8 GB 
Graphics
Minimum: NVIDIA GeForce GTX 760 (2GB VRAM or better) | AMD R9 270 (2GB VRAM or better)
DirectX
Minimum: DirectX 11.1 
HDD/SSD
Minimum: 59 GB 

Recommended Specs

OS
Recommended: Windows 10 (64-bit versions only)
CPU
Recommended: Intel Core i7-4770 @ 3.4 GHz | AMD Ryzen 5 1600 @ 3.2 GHz or equivalent
RAM
Recommended: 16 GB 
Graphics
Recommended: NVIDIA GeForce GTX 1070 (6GB VRAM or better) | AMD Vega 56 (6GB VRAM or better)
DirectX
Recommended: DirectX 11.1 
HDD/SSD
Recommended: 59 GB 

4K System Requirements

OS: Windows 10 (64-bit Fall Creators update)
CPU: Intel Core i7-7700 (3.6 GHz or higher) | AMD Ryzen 5 1600X (3.6 GHz or higher)
RAM: 16 GB 
Graphics: NVIDIA GeForce GTX 1080 Ti
DirectX: DirectX 11
HDD/SSD: TBC