have the flood come back and a new enemy seen in halo wars... rebel humans that are fighting against you to keep u from finding something and keep a forerunner based enemy and forerunner ally in it too. possibly add the arbitar and friendly elites and add elites that are still with the covenant. also re-add in the brutes i was confused when the brutes were not in halo 4 even thought there weapons were. and possibly one more race that is violent and brutal like the brutes and flood (savage beasts) and one last request i would like to see upgradable weaponswith lights and scopes and a loadout for the campaign as well. lastly i would like to see a customizable class so you dont have to be a spatan but a marine, odst, elite, grunt, etc.