After playing the other 2 games, it seems kratos will slash zues' head of and wear it around his neck then sit on his throne, and say the dreams are finally god now im god!!!; dramatic music then it ends (its only a guess) 

At the end, the ps3 will explode because the level of astonishment.


On topic

He will fail to kill Zeus though.

I want to kill Zeus, but if that happens, there is no God of War 4. Maybe you could kill all of the gods, and then realize that you don't like things with the titans running the show and so you go out to kill them in God of War 4. As you can tell I really don't want the series to end.

We will not kill Zeus...I think Gaia will be the main enemy of the kratos in GoW3

I think that too that he will turn against the titans.

i have never played any of the god of war games, but im gunna get god of war 3... will i need to know what has happened in the past games?

who are the titans?

The titans are the titans which Zeus eliminated in the past then Kratos goes back in to time and brings all the titans back in to his time to fight Zeus.

Kratos brother, not following u.

s-grandi93, yes you probably will need to pick up the first 2 games.
tbone, in the extras for god of war 1 they had a teaser that in the sequel you might fight kratos' brother who died as a baby and grew up to be hell spawn.