Would you rather see turn-based or realtime gameplay? The advantages of turn-based are quite something; more time for the AI to think and the ability to play hot-seat and PBEM games. A mix like the system of Baldurs Gate, where you can choose turn-based or continuous but still based on a turn-based system, could also possible in the future.

Efrem
Combat Mission style control system
Could you tell me how that works? Or how you think it would apply to a medieval wargame?

Crazed Rabbit
I think, similar to your idea, that you could have a base unit of say 100 men
A base unit is not really necessary, you can have small units or big units, it doesn't really matter. You'll have to link the smaller units as they are more easily pushed back and consequently broken then larger units.