There is a new release of CentOS Linux 8. The brave new “stream” world
includes new naming as well, but we know where it came from:
“Effectively immediately, this is the current release for CentOS
Linux 8 and is tagged as 2105, derived from Red Hat Enterprise Linux 8.4
Source Code.” See the
release notes for the changes in this release.

Source: LWN.net – CentOS Linux 8 (2105) released