Basically Halo 5 except -Option to turn on splitscreen but sacrifice some better graphics -Add real firefight along with warzone firefight -12 hour campaign -2 light, medium, heavy, and air vehicles per faction -It's about time for Halo to get some new weapons added to its arsenal -Old Rocket Launcher model -Credit system -More of an old school art style (cool golden visors and helmets that look like you could actually see out of them) -Armor unlocked by rank, achievements, and collectibles -Vidmaster needs to come back -Small story expansions that would not be part of the free updates -Spartan Ops with a better story and less repetitiveness Edit: here's some more - Duel wielding - Multiple endings and multiple legendary endings (up to 7 because bungie) - DMR will be the bridge between snipers and battle rifles instead of being a single shot reskinned battle rifle - New races introduced as well as a new sanghelios government combining with the UNSC - More worlds to visit each mission - More skulls - An actual LASO and Mythic difficulty setting - More use of user created content And last, but not least...a hotter H4 esqe Cortana design. IMO Cortana looked ugly in H5. She should also have a special spartan suit that she can digitally enter and control.