CVG found a thread on Reddit where some Call of Duty: Ghosts players on the PC noticed a playlist that wasn't meant to be in the game yet. The playlist was published and then quickly pulled down, but not before the internet managed to grab some screenshots. The map names that were seen are Swamp, Battery, Red River, Rumble, Gaza, Dome, and Boneyard.
We knew that there would be map packs and downloadable-content for Ghosts, just like every other Call of Duty. We know the names of the maps now, so that's exciting, I guess.
This 2015 D.I.C.E. Summit talk explains the entire history of Call of Duty's zombie mode
10:30 AM on 02.12.2015
Call of Duty unleashes DLC, zombie horde on PlayStation and PC in late February
5:00 PM on 02.04.2015