The mandatory May 26 update focuses on faster progression and more useful rewards. The main changes affect Builder Base upgrades, early Hero access, and Gold Pass purchases.
Main Changes
Additional Builder: Builder Base receives another permanent Builder, available in the shop from Builder Hall 2 after all Home Village Builders have been unlocked.
Earlier Barbarian King: The first Hero now becomes available at Town Hall 4 instead of Town Hall 7.
Improved Gold Pass: Beginning with the June pass, players who upgrade during the month receive premium points for stamp cards they already completed. Consecutive monthly purchases also award one extra Stamp.
Supercell also pointed to upcoming balance adjustments involving Giant Arrow, Dragon Duke, Sky Wagon, the air-versus-ground meta, and CWL modifiers for Titan and Legend Leagues.
Official source: Clash of Clans