If you have any worries about whether Santa Monica studios are currently working on the next installment in the God of War series or not, put your worries to rest. God of War 4 and a new Medal of Honor game are coming in the near future. How do I know? Look below.  
 
 
 
This is from David Thornfield's linkedin profile who is a mo-cap animator at House of Moves. He is Creating 'high Quality animations using Motion Builder editing motion capture data for both in-game and cinematic animation' for God of War 4, the next Medal of Honor and WWE 13 since November 2011.  
The only question is: when will Sony officially announce the game? Every major God of War game get released in March, so I would say, maybe next month GOW4 will be officially announced. If not, at this year's E3.