This is not a new version of the API, but rather a certification mark for graphics cards and games. If a product has this logo, it is guaranteed to support the full set of four key "next-gen" technologies that are part of DirectX 12. The main pillar and mandatory part of this certification is just support for DirectX Raytracing (DXR). The other three mandatory technologies are Variable Rate Shading (VRS) for increased performance, Mesh Shaders for more efficient geometry rendering, and Sampler Feedback for smarter texture handling. In short, DirectX 12 Ultimate guarantees a complete "next-gen" experience.
