The official website for The Elder Scrolls Online has details on Update 4, an upcoming patch for Bethesda's MMORPG. The post is accompanied by an Update 4 preview video, and here's word on the patch, which is due next month:

Update 4 is on its way to ESO with tough new challenges. The mysterious tale of Craglorn continues as you and your friends explore a new region of the Adventure Zone and take on the new Trial that awaits you there. You’ll also find a new kind of challenge for your group: the Dragonstar Arena is ready to put the toughest heroes to the test. Watch the video now and prepare for new quests, delves, Trials, and much more in Update 4, slated to launch in September.