God of War will definitely look at other mythologies in the future says director Cory Barlog.
The series up until this point has focused entirely on Greek mythology, making six games where Kratos has killed his way through the entirety of the god roster. The upcoming God of War is going to be leaving all those corpses behind though and put Kratos in the world of the Norse. It's an exciting change as it opens up a lot of new potential for the series and where it can go in the future. Speaking to GameInformer (via Gamespot) the director talked a little about the timeline but also what other mythologies Kratos might one day stab through. Barlog said:
The Greek games were the Greek era of God of War. Moving on, the next mythological belief system he interacts with became the Norse era of God of War. But we may end up going on to the Egyptian era and the Mayan era and so on and so forth.
Now, the "so forth" at the end of that sentence does lead me to believe he was rattling off examples rather than announcing future adventures. At the same time, those being at the forefront of his mind could be telling. For me, the question is how long will we be spending in each mythology? Six games, or one? I'm not totally against the idea of hopping to a new world every game. It certainly would feel fresh.