We like Kratos, but he is a bit of a one note character. He's big and angry. He converses exclusively in shouts. Revenge is the only thing on his mind, besides the constant awareness of if the player is hitting the right buttons. He mercilessly murders anyone who attempts to prevent him from reaching his goal. We think it's time for a new character, the world can only take so much fury, even the Incredible Hulk has mellowed out recently.
And besides - Kratos is dead. Yes - gone, expired, ceased to live, bereft of life. When we said earlier that Sony Santa Monica didn't leave themselves much room for expansion, we weren't kidding. So a new character is the way to go, unless God of War 4 ends up being a prequel, or the developers bring Kratos back from the dead and use him again, but that would cheapen the ending of the third entry, don't you think?
We want a new character that's just as badass, and just as violent as Kratos, but actually lowers his voice and uses his brain to think about more than just revenge once in a while.