PSLS writes:
Could Kratos, having defeated the Gods of Olympus went on to become a god himself? We'll have to wait and see, and apparently, we'll have to wait until May 28th for more information. Which if you have your calenders marked like I do, is right before E3 hits in June.
A recent interview with the game's director, Stig Asmussen adds credence to this theory, as Stig himself concludes that Kratos' immortality "definitely" allows him to continue on to another series
Whatever it turns out to be, I can't wait