Bigger worlds!!! Period!!! I felt robbed when I purchased and opened some of the more recent expansions and saw the number of buildeble lots. Get famous was just the same, (although it has more than others). I appreciate being able to manipulate terrain and building heights and such, but we need more lots without having to wipe the existing buildings. I love this game; I've killed many an hour with it. I'd just like to have more lots per map.
And cars..... Definitely want cars!