Elaborating on yesterday's teaser trailer, Treyarch has now spilled the beans on the next downloadable content expansion for Call of Duty: Black Ops II. Titled Apocalypse, the game's fourth and final DLC pack will launch on August 27th 2013 for 1200 MS points on the Xbox 360 (a timed exclusive ahead of PC and PS3 as always), and in addition to the expected "Origins" co-op zombies scenario, will also feature four new multiplayer maps:

“Apocalypse is Treyarch’s grand finale to Call of Duty: Black Ops 2,” said Treyarch studio head, Mark Lamia. “It is the perfect culmination of our efforts, and fan feedback, with two all-new multiplayer maps for players to experience for the first time, and two fully reimagined fan-favorite multiplayer maps from past games – and Origins, our most epic Zombies experience to date.

Origins takes players to a “Dieselpunk-stylized World War I-era France” where they will encounter the return of the four original heroes from the very first Zombies map, Tank, Nikolai, Takeo, and Rictofen, as well as hordes of zombies that have overrun trenches and fields, as well as the ruins of a mysterious and ancient location.

Unleashed after the Germans unearthed the mysterious Element 115, this next chapter in the Zombies legacy will explore the saga’s origins as players reunite with an unlikely band of soldiers that come together to defeat the greatest evil the world has ever seen, using a period-specific arsenal that includes Wonder Weapons that harness supernatural powers, a diesel-drone and Mark IV tank, as well a new perk machine and power-ups – and that’s just the start.

Players will need all the help they can get to succeed in defeating the undead, as well as evading an unprecedented 1,000-foot tall robot abomination.”

PC and PlayStation 3 release dates have not yet been revealed, but previous Call of Duty DLC releases have typically followed one month after their Xbox 360 launch.