Two elements I'd love to see in a future patch:
1) As has been mentioned in other threads elsewhere: a report in the battle log, indicating the flow of battles: who entered battle, when they entered, effect of auxiliary forces, such as flanking by cavalry, and on and on;
2) a report in the long on which elements actually received replacements in a given turn - right now players are in the dark, or have to go through the forces one by one looking for the effect of replacements.