10: Minigames; I had a dream where you could play as an AI, you could do a teleport to certain things like consoles, and could hack equipment.
9: Elites... lots of Elites.
8: Dual Wield.
7: Armors with strong accent colors. (armor where the secondary color isn't scattered if not half absent)
6: A new HUD (I don't mean entirely different, just something a little new).
5: New armor. (For Spartans, Elites, and hopefully Flood)
4: More Tac Packs and Support Upgrades.
3: New and old emblems brought back. (Seventh column, territories, a new forerunner set, etc.)
2: Firefight and Elite Ops as well as Spartan Ops.
1: New and innovative game types. (I liked Extraction because it's something new, and can be refined)
There's a million other things I want (female elites, infected and flood, etc.) but this is a top ten, these aren't in any specific order.