Red Hat released RHEL 9 on 17 May 2022, one week after the announcement at Red Hat Summit in Boston. This page has links to supporting blog posts, documentation and changes in RHEL 9
RHEL 8.6 was released on 10 May 2022. Upgrades from RHEL 8.5 should be straightfoward – here’s links to the official release notes and support blog posts.