8. Ability to see how many people (Soldiers and civilians) have died in a war. A running total, maybe even a paragraph summarizing the terrors of the war like the Senate has for other nations as Rome.
9. A volunteer mechanic, where happy and populous settlements will volunteer for the military, so you can make cheaper military units. If you have no volunteers, you can "draft" by building, which will lower happiness slightly, cost more, and take away from the city population.
10. Different revolt mechanic. Civil order and happiness are different. People can be unhappy, but might not revolt if you have a large army or are known for executing civilians who try to rebel. Family members further reduce odds of revolt unless they're traits specify otherwise.
11. Larger cities, with the ability to lay ambushes behind buildings and such.
12. Better diplomacy, better AI, naval warfare, more nations, more areas ect. All the obvious stuff.