The big change in today’s patch is the addition of the Alarm Bell construction. It can be crafted at the Blacksmith and built on the floor. When interacting with the Alarm Bell, you can queue a “Sound the Alarm” job which will be picked up by any gnome with the Mechanic skill. Sounding the alarm will put your whole Kingdom in lockdown mode. Military gnomes will continue guarding, training, etc but all non-military gnomes will retreat to the Great Hall. No more gnomes running into battle to stock dropped weapons or reset traps. To resume work in your Kingdom, you can interact with the Alarm Bell again and queue a job to give the All Clear signal.
On top of the alarm bell, there are a few new perks this patch, so check out the full patch notes here.