Whoops-a-daisie! It looks as though Amazon has gone and leaked the existence of a brand new God of War game for the PlayStation 3, titled God of War: Ascension.
We know very little about the game, other than the fact that it's some sort of prequel set before Kratos became the "Ghost of Sparta". This Amazon link features a short teaser trailer, but no actual game footage.
It does appear, however, to show Kratos writhing in some sort of pain. Ah, well, at least we know it exists. And that it features Kratos.