UPDATE: It appears that studio head Jason West has been let go from Infinity Ward. West's LinkedIn account now lists his position as "past," and shows that the position ended in March 2010. In addition, one of our own sources inside Infinity Ward has said that Activision is "flexing their muscles" against the studio, attempting to "push back against change." More as we hear it.
http://www.1up.com/do/newsStory?cId=3178175