User blog comment:Ausir/It takes 500 people to make Call of Duty/@comment-46.151.136.5-20110909150206/@comment-3964768-20110909174310

Sledgehammer Games is making one. It's on haitus now, though they'll probably start when MW3 is out. As for Spark Unlimited, they HAVE made one. But they went over the budget (quite a lot) so I think they won't make another COD game for a while, if not ever.