According to PSM3, a UK-based PlayStation publication, God of War 4 is in the making and should be arriving in September 2012.
“PSM3 has heard from another source that God of War 4 is coming, and will hit in September 2012,” states in the latest issue of PSM3 magazine. “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.”
God of War III launched in March 2010 to critical acclaim, concluding the original trilogy, but the game’s developers have said that it does not mark the end of the series.