Personally i would LOVE to see Armor abilities play class roles in things like 5v5 and BTB. they say that the armer mods were going to take changes, but i would like to see "loadouts" carry class descriptions as they have, but be customizable within their fields.
essentially i would like to be able to run support, so i would have something like +8% damage to taking out sheilds, but -10% to actual armor/body hits. or have larger ammo clips at the cost of slower reloads.
to me it would be a cool side project for a mode that will focus a bit more on the team and unique abilities than just getting the highest KD.