The modification allows alerts to be sent when a player is attacked or a new age is about to begin (see persistent worlds in the previous blog post). Other alerts could be added in the future.
Balancing changes this week included the ability for Barbarians to quest horde. Before this mod, low-level Barbarians had a tough time of establishing a foothold. With this change I also added a distinct type each class faces when attacking the horde: Fighters > Barbarians, Barbarians > Sellswords, Mages > Crusaders, Clerics > Magical Army, Rangers > Undead. The mechanics are the same, but it adds some variety.
Finally, I added support in the Windows client for city owners to open ports. I also modified some of the structures used in the game client. This last change should not have any noticeable change but it helps me sleep better at night. :-)