First of all they need to fix the frostbite engine if they are going to continue using it. Standard features like saving loadouts, damage direction indicators, hit detection were broken on BF4 and continue to be on Hardline. It boils my blood when someone shoots me from the front and the engine indicates it was from behind me. Still not fixed in Hardline, worked fine in BF3, I don't know why they fucked with it.
As HG says setting hardly matters as long as basic features and balancing work properly.
Kill trading also needs to go or be reduced to at least BF3 levels. Either increase time to kill or don't make bullets actual projectiles in the game engine.
I'd like to see a 2143 with similar player movement to Titanfall as I find wall running around the map to be half the fun in that game. Would work great with big Battlefield maps and vehicles