Please check the roadmap to see what's new.
With this release, previous 2.0.x stable will no longer be available directly via Debian. You may use:
deb [] http://debian.installiert.net/hellfield/ablg bookworm-ablg-snapshot main contrib non-free non-free-firmware
in case you want to stay on 2.0.x; i.e., if there should be an update needed, it would go here (but most likely there won't be further updates for 2.0.x).