I noticed a few things with the units:
-apparently no "modern" artillery, you go from catapul to cannon to artillery (a la "Replacable Parts" in III). I assume "machine gun" is an artillery unit?
-in the infantry list, is that a rifleman, a bazooka man, a marine and somekind of special forces unit (night vision goggles). Also, after him, somekind of tank (Mech. Infantry?)
-the great artist is Shakespeare, with a skull (at first I thought "woah, what kind of super-destructive unit is this? Germ warfare or something?"

)
-am I the only one annoyed by the fact that all of the units aren't protrayed in the same way? It's an extrememly minor point, but I like the protraits with the guy lined up with the weapon they carry, but then some mounted units like the horse archers and chariots, as well as the longbowmwn, completely deviate from this.
All in all, looking really cool.