The DC Universe Online site has been updated with a preview of the next major content update coming to the game in March. Called Justice League Dark, the new episode will launch on March 28th. Gotham City is threatened by a "massive, tentacled Daemon" from another plane that is descending from a giant rift that has opened above the city.
Justice League Dark features a large-scale episode, with level-agnostic event versions of content available to all players for a limited time:
New and returning heroes and villains, including Zatanna, John Constantine, Mordru, Doctor Fate, Felix Faust, and Shazam
A variety of singleplayer and multiplayer adventures set in several magical and otherworldly locales, including the House of Mystery
Player rewards, including new gear, styles, artifacts, base items, and feats
Check out more details on the DC Universe Online site.