References to DirectX ray tracing were found in the latest AMD drivers indicating that AMD could be enabling ray tracing support for the RX 5000-series Navi GPUs with the release of the December update for Radeon Adrenalin Software. Although just a software fix for now, this could pave the way for hardware-accelerated ray tracing in the upcoming Navi GPUs based on RDNA 2.0.
https://www.notebookcheck.net/AMD-rumored-to-bring-ray-tracing-support-for-current-Navi-GPUs-in-December.437025.0.html