Polygon has a some general details regarding the first dlc, Crown of the Sunken King, up here.
My big main take-aways:
- The dlc starts from the Black Gulch.
- 3 main areas total, multiple bosses.
- One of the areas sounds very vertical in design, kind of like the Catacombs from DkS1
- Flying enemies that shoot equipment dissolving acid upon death.
- A bunch of status ailment based enemies in general.
- The final boss is not going to be yet another guy in armor with a big mace sword.