Sorry if i missed it, But does Unity currently support DirectX 12?
Not yet. It’s scheduled to arrive with Unity 5.3.
Found this while tinkering with the Stand Alone Player Settings in Unity 5.1.2p3
I haven’t tried if this is working on my DX12 card, currently don’t have time to tinker further. This one is still experimental and it will not be official until 5.3 so it maybe just a placeholder and won’t even work at all.