The following should be available to us in some way, most likely through forge and custom games and warzone because some of these might not work well in competitive play. EVERYTHING should be available to us in forge, if it is in the game. Weapons, vehicles, crates, trees, sounds, effects, etc.
Vehicles, Human
Warthog, Chaingun
Warthog, Gauss
Warthog, Rocket (Improve lock on time and range against aircraft)
Warthog, troop transport (2 spartans in back seat)
Mongoose
Gungoose, machinegun
Gungoose, grenade launcher
Gungoose, Hydra weapon variant (this is what I believe the ONI gungoose should have been)
Scorpion (add passenger seats to tread covers)
Mantis, chaingun/rocket
Mantis, gauss/rocket
Cyclops
Elephant (Updated design)
Mammoth (Warzone base? Maybe a larger spiritual successor to Sandtrap meant for Warzone.)
Pelican (Driver, gunner, 4 passengers)
Wasp
Hornet
Falcon
Broadsword
Vehicles, “Covenant” (Could be Banished)
Ghost
Banshee
Wraith
Seraph
Spirit
Phantom
Locust
Goblin
Scarab (Rival the Mammoth in Warzone)
Chopper
Blisterback
Revenant
Spectre
Vehicles, Forerunner
Phaeton
somthing similar to the role of the warthog/spectre in its own unique way
forerunner tank
forerunner dropship
forerunner equivalent to ghost/gungoose
war sphinx (if it works on a similar level to the mammoth/scarab)
forerunner space fighter (equivalent to the Broadsword and the Seraph)
That’s a lot of vehicles. I’m not even a developer and this list seems scary.