It had been rumored that multiple studios were collaborating on this year's Call of Duty effort and now, that appears to be true.
It seems at least one studio is offering assistance: Raven Software, responsible for last year's great Singularity , has posted up a job listing that sort of confirms their involvement. Here's part of the ad:
"RAVEN SOFTWARE, developer of numerous award-winning games, including contributions to the blockbuster Call of Duty series is seeking passionate designers to join an established team at work on a first-person shooter."
The first rumor said that Raven had been asked to stop work on their James Bond and X-Men projects to work on Call of Duty and earlier this year, another job listing said the team was working on an "established, first-person military shooter." However, we're not entirely sure what Raven is doing for the next CoD; are they handling the multiplayer? Single-player? Something else? Is the new CoD really a team effort with Sledgehammer Games, Raven, and Infinity Ward?