A help wanted ad from Raven Software for a Lead FX Artist adds further credence to the rumor that the Activision-owned studio is working on a Call of Duty game. Word is: "Raven Software, developer of numerous award-winning games, including X-Men Origins: Wolverine, Wolfenstein and Singularity, is seeking a lead visual effects artist to drive the development of stunning visual effects for an established console-based, realistic, first-person military shooter." Thanks MCV, where they note that the Call of Duty series is Activision's only series that fits that description.