From the announcement:
As the next game in the Survival Series, Pandemic: Rising Tide continues the hallmarks of the series. Each game enjoys a strong resemblance to the original Pandemic while uniquely adapting them to a new locale. On the lakes and polders of the Netherlands, the threat is not from diseases but from the water itself. With land becoming more and more scarce and water levels rising by the day, a modern system is needed to stem the rising tide.
In Pandemic: Rising Tide, it is your goal to avert tragedy by constructing four modern hydraulic structures in strategic locations that will help you defend the country from being reclaimed by the ocean. Storms are brewing and the seas are restless. It will take all your guile to control the flow of water long enough to usher in the future of the Netherlands. It’s time to get to work.