FORGE
Editing terrain
Change time of day
Change weather
One big forge world
A Welding tool that lets you attach different pieces together
More colored parts
Make it so we don't have to wait for the game to generate the light before we go from ball to spartan
VEHICLE
Some sort of boat
A forunner vehicle
Unsc flying vehicle
(This ones probably not going to happen) drivable Vulture from halo wars and Mammoth from halo 4
OTHER
Better ranks like warrant officer, brigadier, general, etc. instead of just rank 1, 2, 3,4 etc.
Dedicated servers for co op campaign and firefight/spartan ops
Bring an improved firefight back
More weapons
Theater for campaign and spartan ops/firefight