http://blogs.nvidia.com/blog/2014/03/20/directx-12/
How similar is the X1 API to the DX12 announced features?: pipeline state objects, bundles and command lists, descriptor heaps and tables
Xbox One is DirectX 11.2, but I guess Turn 10 had access to lower hardware level on Xbox One for Forza 5.
EDIT: Maybe DX12 will allow that level to other developers?