I haven't seen anyone talking about this yet, so apologies if I am repeating a thread.
There seems to another fundamental change for armies. I got this from:
.
1) Armies are led by army commanders. While now it seems that you can have units outside of an army commander.
2) The Commander functions like a Carrier, in that you can stack individual units within the Commander (so a commander starts with 3 slots). Then the single commander can drag around the units.
3) When you fighting, you unpack the units and they appear on the map in some 'logical' organization (so maybe your slingers don't get positioned right next to an enemy swordsman).
4) You can apparently attack with each unit one at a time, or there are all unit attacks, all range attacks, all melee attacks buttons.
5) Each Commander has a skill system with 5 trees, which includes things like bonuses to attack, more unit slots and so on.
6) Re-enforcement mechanics for adding/replacing units is now a teleportation mechanic.
My first reaction was extremely negative (since it once again looked like a mechanic from the way Amplitude organizes their armies). Much of the actual combat system seems to be the same however.
There seems to be a weird combination of removing and adding particular micro managing (adding a land army carrier, but now abstracting army travel).