I played a test game (currently to about 2000BC) on 5v5 emporer and found the following.
It didn't show battles between my forces and barbarians/animals IBT, except if it was featuring Civ#5 units. Am currently about to wage my first war on an enemy AI so will report on whether the same is for that.
Jeep is right about production seeming slow compared to the pace of research. I had BW, IW and AH all researched before I could even produce 1 worker in any of the 5 civs to take advantage of the bronze/iron/horses.
The AIs are all heaps ahead on score but have many cities, while I only had 8 in total but haven't seen any axes/swords only archers and I've already sent a stack of my own their way. They have founded 3 religions, so even in AW, they haven't researched the military techs!!
It does take alot more time.