Full DX12 video up.
http://channel9.msdn.com/Events/GDC/GDC-2015/Advanced-DirectX12-Graphics-and-Performance
Unity move from DX11 to DX 12.
Before: 23ms for the frame
After: 13ms for the frame.
I need some help from more of the technically sound crowd here.
Also, there are two feature levels. FL 12.0 which is pretty much all cards and Maxwell is FL 12.1.
The 20% GPU improvement quoted by Phil appears to be related to UAV barriers and the improvement in Fable Legends when you just move from DX11 to DX12. It jumps from 900p to 1080p. More details on Friday.