SimCity." A new trademark for something called SimOcean was filed earlier this week.
The filing was made in Europe and spotted by Siliconera, and beyond that we don't know much else. Maxis produced a slew of Sim offshoots over the years, including SimHealth, SimTower, SimFarm and many more. We'll have to add SimOcean to that list if it ever becomes more than a trademark.