Debian has a policy of only cherry picking security updates, or critical bugfixes, in order to ensure maximum system stability. In general, they don't do entire program updates or additional features. For the 4 year lifecycle of a Debian release, it will behave the same as it did yesterday.
As of today, current version of rsync in Debian's stable's packages is 3.4.1: https://packages.debian.org/stable/rsync (archive).
The versions with significant LLM assistance are 3.4.3 and later.