Above and Beyond Technologies announced that the 15.9.1 build was released earlier in the week. The largest addition to this build is the re-introduction of the siege system. Players can place down siege camps and adjust the windows for the multiple phases of the siege. During 15.9.1 you can damage structures, but not destroy them. This restriction will slowly be lifted after sufficient testing is done and proper balance is achieved.
Beyond sieges more social features were introduced in this build including additions to Looking for Group and Looking For Nations. The developer also introduced new item rewards from creatures and rewards. Pets received a small update to make it easier to identify skill levels and the typical slew of small content and bug fixes.
You can read the full patch notes here.
Source: Press Release