Radeon Rays 4.0 release is now available and comes with added Vulkan API, HIP and DirectX 12 support but drops OpenCL. It also maintains support for CPU-based execution too.
This accelerated ray intersection library for DirectX 12, Vulkan, HIP, and CPU comes with new features and various other improvements. AMD originally made this release closed-source but reversed that decision and it is once again open source like its predecessors. Even though it is just some parts of it.
The announcement was made as part of the GPUOpen relaunch.