1. Weapon ideas/suggestions:
Some sort of electricity based weapon (UNSC)
(^Shock and Awe / Shock Therapy could be achievement ideas for this weapon ☺^)
Some of the newer shooters have a bow/crossbow type weapon
Some of the older weapons should come back
2. Enemy ideas/suggestions:
Brutes
Flood
Drones
Sentinel Enforcers
(^Would be nice to see them again.^)
A new Promethean enemy, something more humanoid
3. Vehicles idea/suggestions:
Any of the old vehicles (Chopper, Elephant, Prowler, etc)
Behemoth (idea, pretty much bigger than both the Elephant and Mammoth, used for mass transport of troops, vehicles, etc)
More air vehicles. Halo 4 had a lack of that.
4. Levels/missions:
Earth. Some sort of big city like New Mombasa, maybe bigger and with a better color pallet.
Remains of Installation 04
(EDIT:2/16/13) - Outside part of one of the rings, sorta like this - http://i4.photobucke...ion/arkDome.png
5. Other suggestions:
Dual wield needs to come back
So does Firefight
And The Arbiter
Two Covenant factions - Covenant who are still allied with the humans, and Covenant who aren't
Old gametypes
All I could think of that seemed like decent ideas.