User blog comment:Argorrath/Sledgehammer Games claims to be working on a new MW game/@comment-4122733-20130719145010/@comment-25496444-20130720081603

Quoting from Wikipedia:

"A 2010 Q3 earnings call from Activision confirmed that the eighth installment of the franchise was currently in development by Sledgehammer Games and Raven Software and due for release "during the back half of 2011". This was revealed to be Infinity Ward's Call of Duty: Modern Warfare 3, with the latter developers co-developing multiplayer. "