DirectX 12 Ultimate Announced

Microsoft announces DirectX 12 Ultimate, which will bring new technology they've developed for Xbox Series X to PC. This includes inline ray tracing, variable rate shading, mesh shaders, and sampler feedback, and they offer a deep dive to explain each of those features. They also offer with reassurances that this will not impact game compatibility. Here's the overview:
Microsoft’s Game Stack exists to bring developers the tools they need to create bold, immersive game experiences, and DX12 Ultimate is the ideal tool to amplify gaming graphics. DX12 Ultimate is the result of continual investment in the DirectX 12 platform made over the last five years to ensure that Xbox and Windows 10 remain at the very pinnacle of graphics technology. To further empower game developers to create games with stunning visuals, we enhanced features that are already beginning to transform gaming such as DirectX Raytracing and Variable Rate Shading, and have added new major features such as Mesh Shaders and Sampler Feedback.

Together, these features represent many years of innovation from Microsoft and our partners in the hardware industry. DX12 Ultimate brings them all together in one common bundle, providing developers with a single key to unlock next generation graphics on PC and Xbox Series X.