What would you guys like to see in AOE3 DE?

I've been keeping up with the new info about AOE2 DE and it's got me thinking, apart from 4k graphics which are probably gonna be coming our way, what else would you guys be hoping for in AOE3 DE? A lot of the new stuff that's coming to AOE2 DE is stuff that's already in AOE3 (particularly the UI improvements). New civs? Campaign? I'm finding it hard to think of what they could add or improve upon without changing the identity of the game.