http://www.vrworld.com/2015/04/29/directx-12-on-xbox-one-com...
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Xbox One uses "Graphics Core Next", which certainly does support DX12.
http://wccftech.com/microsofts-directx-12-api-supports-amd-g...
[1] https://community.amd.com/thread/180474
[2] http://news.xbox.com/2015/01/xbox-one-phil-spencer-unveils-n...
I'm going to cite me. I work on graphics engines for all the major consoles and PC. Have been looking at DX12 on xbone for over a month already.
The lack of a low-level API on PC is why bad console ports have happened in the past - so there's your citation: every bad console port ever.
If it literally ran Windows, it would mean that GPU work is actually scheduled between applications and we'd have TDRs and all sorts of things.