The mission, called Dust Palace, is set on Mars and can only be played by those who have reached level 18 in the game. The co-op mission tasks a trio of players to battle against a race called the Cabal, who are mining an ancient city in the search of a valuable technology.
Some of the Cabal's more dangerous soldiers include Centurions--burly field commanders who use jump jets--as well as the Psion Flayer, which is a more nimble enemy with advanced AI.
The mission also includes PS4-exclusive loot and gear to discover and collect. Sony has said the exclusivity period ends "Fall 2015".
A walkthrough trailer of the new level can be found above.