At the Bethesda E3 Press Conference, the studio showed a trailer for the next clip of content coming to Elder Scrolls Online: Elsweyr as part of the Season of the Dragon. The fourth part is called Dragonhold, and continues the story previously established in the last season of the game.
Dragonhold is slated to launch in November of this year. The developers also announced a dungeon DLC, Scalebreaker, coming to Elder Scrolls Online in August. No other information about this DLC was specified.