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This.
And also a 3rd Axis Army, I'd prefer if it's an early-game focused Italian-German one but I don't care if they make a 3rd just German one either.
Full modding support for the game.
Native language option for the German (and Soviet) Armies like in the Red Orchestra series of games.
I think there were a couple of more things but I'll add them here if I remember them.
Edit: I remembered now.
Revamp all of the remaining useless commanders, abilities and units.
Add new commanders, especially for the Western Front Armies.
And for the love of god fix the bad Army design that's been plaguing the game for 3-4 years now.