Unlikely, unless we are talking about just adding some features to the DX12 spec. Let’s call it Ultimate 1.1 or whatever. The whole point of going to low level APIs like DX12 and Vulkan in the first place was to reduce abstraction layer and allow developers closer access to hardware to do what used to be done by older APIs, but now fully in-engine and more efficiently. Plus it gives access to all the new toys, like RT, but also much more. Creating another DX11 is pointless with this in mind and any improvements to 12 can be evolutionarily rather than “here’s a whole new version, learn everything from scratch again”. And the current full DX12 Ultimate spec is fairly future proof in terms of features, most of them are only now seeing full non-gimmicky use as AAA devs leave the previous gen consoles behind. And for smaller and indie studios who don’t have the expertise to work with low level APIs the DX11 (and OpenGL, natch) is still there and serves all their needs, really.