Also maybe a form of variation of the armors for multiplayer. Meaning rather than having different suites for looks but for what they can do. For example certain armors have booster packs for elevation, some have a time limit camouflage like the Arbiter's/elites. Some allow for faster movements/speed increase, some have an ammo capacity increase or extra grenade/s, Some allow a third weapon to be carried (Maybe an unlimited sword from spawn can be a higher level armor from this group) , some allow faster health regeneration, some come with a particular element like a drop shield or health kit.... ETC. And just have the armors have different levels to them and become obtainable as the spartan ranks up and makes different achievements. That way there is a real difference when coming up against a spartan that out ranks you other than the somewhat true and somewhat false impression of skills or experience!!! Would make your promotion to ranks really appreciated. That's just what I think. Nonetheless, am sure what they come up with will be great.