Neversoft is apparently working on a Call of Duty game, though the developer hasn't said in what capacity. The company behind Guitar Hero and the Tony Hawk games may be pitching in on Call of Duty: Black Ops 2, or helping to develop the next iteration of the franchise.
The Neversoft site says it's working "in support of Activision's Call of Duty franchise," which would seem to imply that they're pinch-hitters instead of taking the lead. However, its jobs page calls for open positions on more foundational roles, like "Senior Concept Artist" and "Single Player Design Scripter" for an FPS. Those positions help create the visual look and mission structure of a game, both of which must already be set in stone for Black Ops 2.
Other open positions include animators and level designers for both single- and multiplayer. Neversoft may be helping develop next year's Call of Duty installment instead of Black Ops 2, but without official word from Activision we can't say for certain. Shacknews has contacted Activision and will update as more information becomes available.