The free expansion will be rolled out in three phases. The first chunk of content will be released on June 16th, followed by the expansion's debut on Steam on the 18th. The studio plans a third phase for the 26th that will include delayed features and additional polish.
Siegeworks will double the number of towns in the game, add siege engines and units, and present a new pathfinding system. On top of that, players will be able to team up for epic batles via the new guild alliance feature.