I've read quite a bit about the different level of detail people want and about balancing the game between accesiblity to new and more casual gamers vs stratagy enthusiasts. I think the best way this issuse can be addressed is with game scalability in the set up options. Of the more made available adds to the time and resource investment in the game, but can also add additional and customizable levels of dificulty which increases replay value.
For example take the number of turns. As I understand this is going to be 2 per year. I have seen quite a few saying they would prefer 4. It would be nice if you could set this on an option so you could choose say 1, 2, 4, 6 or 12 turns per year, with all 4 seasons in the last 3. The number of turns per year should then affect production rates. A unit that would take 1 turn on two turns per year would take 6 on 12 turns per year, and you could build 2 a turn on 1 turn per year. This might also be useful if you could change the number of turns per year mid-game. So if you were just working on building up your armies and infastructure you could ste it to 1 turn per year and churn stuff out until you were ready to move your armies out.
Antohter area could be supply line detail, army retaining method, etc.