We already have Simcity 5, it's just called Simcity Societies.
http://www.ea.com/simcity-societies
After that blunder, I have zero hopes for the new Simcity game.
Hell they broke the Sims franchise with the Sims 3. While it did add some innovative stuff, 90% of the new expansions are bug riddled glitchy messes that get churned out every 6 months. Each expansion barely fixes any of the previous bugs(unless they're game breakers) and then adds a plethora of new bugs. If it's the same team, you shouldn't get your hopes up.