I kind a like the idea of taunt. I think EVOLVE did a good job of getting team-mates communication going. Even help deaf gamers that can't use a mic.
As for character, I like to see class return to WWII. Like, Scout, Engineer, Captain, Sergant, Light Specilist, Heavy Specilist, Sniper, Demonlition & Translator (speaking over many languages).
Abilities unlocks, sharp-eyes...point-man...quick reload...regen health...certain class only for that Special Ability like Heavy Specilist get Iron skin, Sniper get frenzy shooter (hold the left-trigger, it'll locks on group of ZOMBIES' heads, release the left-trigger to pull an animation of killing all zombies in the heads like a MATRIX motion scene), Captain get TEAM BOOST! & So on. For now, I like ZAT right now :)
I like to see more depth in Campaign. Like after beaten the game. Get Unlocks & Bonus on the Campaign Replay. & Plus upgrades your weapons in Campaign. It's getting late. Good night~