Microsoft DirectX 12 is DirectX 11 with Mantle Integrated

Sources have revealed that Direct X 12 is basically DirectX 11 with Mantle absorbed, the performance increase on Xbox One is in doubt.

Can I have DirectX 11 and DirectX 12 installed at the same time

NVIDIA Talks DX12, DX11 Efficiency Improvements - PC Perspective

Discussing the State of DirectX 12 With Microsoft & Oxide Games

Microsoft announces DirectX 12, coming 2015

DirectX 12 vs. Mantle vs. DirectX 11 CPU & GPU Benchmark

Microsoft To Discuss DirectX 12 on 20th March at GDC 2014

RedGamingTech

Deep dive into OpenGL over DirectX layering

DirectX 12 vs DirectX 11 – How DX12 will transform PC gaming on

Best Alternatives to DirectX - Download DirectX App for Free

NVIDIA releases first DirectX 12 Ultimate driver for developers

Microsoft hints that DirectX 12 will imitate Mantle, but AMD insists its

Mantle API vs DirectX 11 on Battlefield 4 – goldfries

What is Vulkan and DirectX and how They Affect Video Games