1. Afaik cities will look ancient, but they won't be "unique", as in customized Athenai, customized Roma etc.
2. Garrisons and free upkeeps will be in EBII.
3. The armour system will be used to represent "eras", but the first release will only have the early era.
4. I don't know if it can be modded and frankly I dislike the idea, a victory, especially an heroic one, usually was due to the incredible work of units within the army.
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