A new soldier for the covenant, because honestly, the old grunt, then jackal shield then head, then elite headshots tactic is getting old and too easy. And when i was trying to get my Raider armor by doing Spartan Ops on legendary, the only difficulty 343 could offer was spamming elites with fuel rod cannons. I also think they should take the halo storyline towards the elite homeworld, and have an infection spread throughout the forerunner technology like call of duty and halo 3 + 4 with the prometheans and covvies turning bad. And bringing back forge world and sandbox wouldn't be a bad idea.
