It's time to slam a celebratory tequila, God Of War fans... but be sure to grab yourself a massive pinch of salt first.
A "trusted source" has apparently told PSM3 Magazine that God Of War 4 is dated for September 2012, and that recent CVs featuring "God Of War 4 cinematic tests" are exactly what they appear to be. Apparently Santa Monica Studio is also working on another "related project" in parallel with the sequel.
PSM3 has heard from another source that God of War 4 is coming, and will hit in September 2012. Our source works closely with the God of War universe, and let slip he'd be working on a related project at the same time.
There you have it. We'll keep an eye on the situation.