Just some suggestion (i thought ill never buy it cause of current condition) :
- UDI (including in the sprawl on the outskirts of your city)
- expandable cities (well, claim the sprawl)
- Regional problems (say, disaster, conflict, etc.)
- ability to control your city sprawl just to some very limited degree
- well, just make the game less plastic and wooden models looking, actually.
I believe the others is already quite good, hope they remember people will build and control a city w/ a lot of sims, not a single or a few sims !
oh yes : hi