1. The locust, Spectre and Rhino should be playable vehicles
2. Invasion should return and instead of spawning on the ground at the start, the attackers should be dropped into the map by a Pelican/Phantom dropship and then respawn on the map
3. The Flood should return sometime within the campaign
4. Duel-wield should return
5. Mission(s) similar to the final escape on Halo Combat evolved: http://www.youtube.com/watch?v=eD3TyjvfAR0
6. A rank system similar to Halo Reach: http://objective514....each-armory.jpg
7. Super sentinels