Beautiful screens- the ones showing units seemed most interesting, in that
1) Great Generals now have an affect in nearby combat,
2) Nearby units might be able to 'assist' in combat,
3) Tanks and Helicopters now have equivalent power (that is to say, awesome).
The graphics, though, seem to have grown a bit more futuristic/childish. Maybe just my interpretation, but some of the pictures for the units/cities are a wee bit cheesy.