Gamesutra has a job listing :
Another Sims game? Sim City 5?
"Maxis is seeking an experienced Graphics Engineer to join our team in Emeryville, CA. In this role, you will be working with a highly talented and experienced team on an upcoming triple-A simulation style game." There are no further hints about the nature of the game, but the listing also includes a platform list: Playstation 3, Xbox 360, Wii, Online Multiplayer, Mac OS X, Windows
Another Sims game? Sim City 5?