Before getting too excited, keep in mind this release states that Ray Tracing for AMD RDNA 2 based chips is a "developer preview" aimed to help developing and testing with the newer vendor neutral Vulkan Ray Tracing Extensions - so if you're going to try playing some games with it, keep in mind it's not yet finished.
Additionally the Radeon Software for Linux 21.10 release also adds in "full support for Ubuntu 20.04.2" so it's now officially supported across:
- Ubuntu 20.04.2
- Ubuntu 18.04.5 HWE
- RHEL/CentOS 7.9
- RHEL/CentOS 8.3
- SLED/SLES 15 SP 2
You're probably best off sticking with Mesa for general usage and gaming though, but if you're seriously enthusiastic about Ray Tracing on AMD this is currently your best bet to try it out.