The Dark Below

The Dark Below is the first of two confirmed DLCs for Destiny. It will be set in the Hellmouth and will involve stopping a dark god who has risen an army of Hive. Story, Strike, and missions from other modes will be added, along with new gear, armor, and weapons. Some of this attaches to pre-existing locations.

It will be released in December, 2014.

Trivia
The trademark for the expansion was filed in 2013. Activision had Blizzard Entertainment file the trademark, which led to some confusion as to whether the expansion was related to World of Warcraft.