Vulkan / Linux gaming.
Vulkan is high-performance graphics API (faster than DX12 in some cases already).
Vulkan also works on those other OS's, versions 7 and 8, while DX12 doesn't, so it covers < 2x the market of 10. Thus it should encourage developers to use Vulkan over DX12.
That's GREAT NEWS for Linux users; Vulkan games will work on Linux, while DX12 games will not.
More promotion to Vulkan, the better it gets for Linux users in the long term.