The job posting on Gamasutra states that the studio is looking for a senior online programmer to "join the God of War team," adding that the role involves supporting "networking needs such as in-game communication, client-server, match-making, leaderboards."
Sony Santa Monica's gaffer, John Hight, has been dropping hints at the studio's future projects in recent episodes of GameTrailers' bonus round, and he's mentioned multiplayer numerous times. If you want to digest some tid-bits from that, you can check the interview through here.
We have faith in Santa Monica handling multiplayer in the right way. It's not in the studio's nature to do something for the sake of it. We're more intrigued that the team appear to be sticking with the God Of War franchise. Fingers crossed for that Viking game, right?