Direct article from joystiq
Call of Duty: Modern Warfare publisher Activision has repeatedly stated that Infinity Ward is doing fine since heads Vince Zampella and Jason West were ousted from the company early last year. A report on the LA Times' Company Town blog, however, tells a different story -- according to the piece, both Sledgehammer Games and Raven Software have been tasked with helping develop the next, still unannounced Modern Warfare title, Call of Duty: Modern Warfare 3.
"People familiar with the situation" claim that Sledgehammer is working with the remaining staff at Infinity Ward on developing the game's single-player campaign, while Singularity developer Raven Software is in charge of bringing up the multiplayer side of things. The sources also contend that, like past Call of Duty titles, MW3 is expected to ship this November. Additionally, Sledgehammer is said to have halted production on its own spinoff Call of Duty title in order to help IW out.
Update: Activision issued a comment in response to the LAT piece, stating, "There's been much specultion recently. We look forward to releasing details for the next Call of Duty in the near future."