Tera Europe recently had a big update called The Corsairs’ Stronghold. The new update included much of the content which is already available in Korea and/or other region, but it will currently stay turned off.
The new update mostly focuses on PvP, offering Corsairs’ Stronghold (20 vs 20 battleground), some General Battleground changes and class balancing. Among other things, Corsairs’ Stronghold features new siege weapons.
The full patch notes can be viewed here.