This is reportedly a GameStop promotional poster dating Call of Duty: Ghosts' first DLC instalment , Onslaught for January 28. It was tweeted out yesterday and picked up by the Call of Duty enthusiast site CharlieIntel.
It describes four new maps -- Fog, Bayview, Containment and Ignition -- and two bonus weapons. Episode one of the Extinction-mode narrative announced back in mid-December is also included.
I've emailed an Activision representative to ask what's up, and if there's any additional information to share. We'll update if he replies.