NVIDIA, AMD, Intel, Qualcom have all been in on the dev of Dx12 and Vulcan from the start,
Vulcan became official yesterday, when Khonos released the 1.0 spec
Both AMD and NVIDIA (yesterday) published resources on their respective pages to help devs with the migration to the new language.
It's a direct replacement for OpenGL, but only time will tell if it can supplant DX as the dominant PC graphics language. Under the hood Dx12 and Vulcan are similar, with the big changes being a change in emphasis, will a lot of the control being moved from the graphics driver back to the games programmer. Will mean more complexity for the games programmers, but they'll at last be able to run the graphics from more than one core. Prior to DX12 and Vulcan the CPU was always the bottleneck.
Both Dx12 and Vulcan draw heavily on lessons learnt from AMDs Mantle. Its the reason why AMD took and early jump in the initial Dx12 benchmarks. They were far more familiar with the technology than NVIDIA. They also has had a lot of catching up to do. AMD have less resources to commit to driver updates, which is one of the reason why they lag behind NVIDIA in performance. With the slimmer drivers required from dx12 and Vulcan, they are now able to better compete.
If you're interested here's the websites
https://developer.nvidia.com/Vulkan
http://gpuopen.com/gaming-product/vulkan/
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