Kotaku, a "source" has told the site that the remaining Infinity Ward developers still working for Activision in the wake of the recent leadership shakeup are holding out on leaving the company for now due to royalties owed by the publisher. As claimed by ex-Infinity Ward heads Vince Zampella and Jason West in their recent complaint against Activision (with regards to themselves, that is), the publisher is allegedly holding out on promised royalties owed to the entire company. The tipster says that, rather than a traditional salary-based reward system at IW, the studio pays "regular or even low salaries" and offers "ridiculous royalties" to the whole staff.
Furthermore, the piece alleges that Activision "continues to delay royalties to other employees in order to keep them at the company" (though it's not clear whether that means other Activision-owned studios as well), and that morale at IW is supposedly "extremely low." We've asked Activision for comment on the claims and will update you if we hear more.
Update: Activision responded by saying, "Activision doesn't comment on industry rumor or speculation." Not exactly a definitive "no," but not a confirmation by any means either. We'll keep you updated as we hear more.