UPDATE: Activision has released an official trailer for Call of Duty: Ghosts' alien-shooting Extinction Mode.
The new mode will be a one-to-four player co-op campaign featuring base defense, scavenging and class leveling. It will look something like this:
ORIGINAL STORY: Activision's upcoming Call of Duty: Ghosts will offer a sci-fi co-op mode where players must defeat aliens and destroy their hives.
The mode is also referred to in Ghosts' list of leaked Achievements and appears to be a replacement for the series' regular Zombies offering.
Activision has already teased the mode via its official Instagram account. We expect a full reveal shortly.