You are ment to work mostly at province level from what I understand. However there are stuff such as buildings or pop that are city level management so I hope they provide good tools to manage such things.So many cities it's almost giving me a headache to look at. I hope the game is decently managable even for large empires.
I do not want to have to click on every city just to see if I can build a granary. I hope they have an auto max build feature for buildings.