Here is what Activision had to say,
Get the first look at Nemesis, the fourth and final DLC Pack for Call of Duty: Ghosts. Nemesis includes four Multiplayer maps: Goldrush, Subzero, Dynasty, and Showtime, a reimagined version of the fan-favorite Shipment from Call of Duty 4: Modern Warfare.
The four-part Extinction saga concludes with Episode 4: Exodus. Explore the biggest Extinction level yet and take on nearly every Cryptid species from previous episodes. You will also contend with the Ancestors – a powerful new enemy with mind control and psionic attacks.
Take a look at the official Call of Duty: Ghosts Nemesis DLC Pack Preview:
The Nemesis DLC Pack will be arriving first on Xbox Live August 5th. Are you excited about playing?
Source: Major Nelson