This is a new DebOps stable release, with partial support for Ansible v2.19, improvements in Debian Trixie support, new Ansible roles including support for NixOS host management and pgBadger, PostgreSQL log analyzer. There are also numerous bugfixes and enhancements in multiple DebOps roles.
You can check the changes from the previous release as well as the changes since v3.3.0 release using the GitHub interface. The changelog for the stable-3.3 branch in the HTML format is available on the DebOps documentation website.