During the IGN live stream yesterday, at the very end, around the 1:58:30 mark,  Neversoft developer Brian Bright states that they’re working on bringing back Chaos Mode from MW3 to Ghosts’s Extinction.

We also can announce that we’re working on a Chaos mode, bringing back Chaos mode…it’s kinda like an infinite mode for Extinction. [And there’s] two more episodes that are gonna be epic.

Chaos Mode in MW3 was added to the Spec Ops Survival Mode; it allowed you to go against an infinite amount of enemies and as the round progressed, it became even more challenging.

There’s no release date about when Chaos mode will be added yet.

SOURCE: IGN