World of Warcraft: Legion System Requirements

[Mastric]

As @Mythosaur pointed out in the shoutbox

WINDOWS

	Minimum Requirements	Recommended Specifications
Operating System	Windows® XP / Windows Vista / Windows 7 / Windows 8 / Windows 10 with latest service pack	Windows® 10 64-bit with latest service pack
Processor	Intel® Core™ 2 Duo E8500 or AMD Phenom™ II X3 720	Intel® Core™ i5-3330, AMD™ FX-6300, or better
Video	NVIDIA® GeForce® GT 440 or AMD™ Radeon™ HD 5670 or Intel® HD Graphics 5000	NVIDIA® GeForce® GTX 750 Ti or AMD™ Radeon™ R7 260X or better
Memory	2 GB RAM	4 GB RAM
Storage	45 GB available hard drive space
Internet	Broadband internet connection
Media	DVD-ROM drive
Input	Keyboard and mouse required. Other input devices are not supported.	Multi-button mouse with scroll wheel
Resolution	1024 x 768 minimum display resolution

MAC

	Minimum Requirements	Recommended Specifications
Operating System	OS® X 10.10 (latest version)	OS® X 10.11 (latest version)
Processor	Intel® Core™ i5-750	Intel® Core™ i5-4670 or better
Video	NVIDIA® GeForce® GT 640M or ATI Radeon™ HD 4850 or Intel® HD Graphics 5000	NVIDIA® GeForce® GT 775M or AMD Radeon™ R9 M290X or better
Memory	4 GB RAM	8 GB RAM
Storage	45 GB available hard drive space
Internet	Broadband internet connection
Media	DVD-ROM drive
Input	Keyboard and mouse required. Other input devices are not supported.	Multi-button mouse with scroll wheel
Resolution	1024 x 768 minimum display resolution

Note: FileVault options and case-sensitive formatted volumes are not supported for installation of Blizzard games.

[Mastric]

I'm assume a Recommended of Windows 10 means DX12?

[Lyntha]

Highly doubt it.  DX12 is still super new.  Nobody really supports it yet other than a few indy games that use UE4.  Blizzard isn't exactly known for being at the cutting edge of graphics technology.