adywan said:

Funnily enough that's exactly what i've been working on. Here they are, although not yet quite finished:

You may want to play with/consider blurring the buildings more and more as they recede into the background due to atmospheric effects (like when you look at a city from far away and it has an almost transparent bluish look). Maybe that was one of the problems with the city effects of the prequels was that everything in foreground to background looked sharp, when you would have focal issues and atmospheric effects that could have made the scenes more realistic.

Things like the monorails and air traffic could be nice visually, but at the same time the focus should be on the main action, not the stuff moving in the background.

I would nix the trains, but maybe put those slow pulsing red lights that buildings here have on the top (for airplanes at night) and have one or two cloud cars VERY far in the distance... maybe just reduced to a black dot with running lights. Maybe something enough to bring the city to life (like maybe the addition of audio effects to indicate a busy city behind and underneath them) but not enough to pull away from what we are supposed to be paying attention to.