I am tired of my self writing same stuff over and over. But ok.
Listen to this BR, part 3 and pay attention to what John Hight say
http://www.gametrailers.com/episode/bonusround/502?ch=3
In short, they are expanding from 105 GOW3 team to 200 man team in short amount of time.
Senior member are going to work on new IP, new guys (from the sound of it) probably on GOW4.
Here is another solid proof that they are working on new IP.
jonathanhawkins
@jonathanhawkins Los Angeles
Sr. Video Game Designer @ Sony Santa Monica, working on a new IP. Shipped games: God of War I, II, & III. USC Comp Sci graduate. Opinions here are my own.
https://twitter.com/#!/jonathanhawkins
There were another hints at it but I am lazy to remember. I know that I read somewhere some Sony guy saying that their big teams will all have two teams going forward. So SSM, ND, GG having two teams makes sense. And it even makes more sense that 3rd party exclusives are far and few so 1 st party needs to be effective. I guess.