I know this is a bit late, but I'll go ahead and tell you some new changes that you will see in Halo 2. N stands for new and m stands for modified.
*Health
You have only your shield. No health dot things, just your shield. So, when you shield is at zero, only one more shot and you are dead. But to make up for this, your shield will recharge faster.
*Weaponry
Duel-Wield N
Yes, you can duel-wield. But with only certain types of weapons can be duel-wielded. Here the those weapons: Magnum, SMG, Plasma Pistol, Plasma Rifle, and Needler. Although duel-wielding would inflict more damage on your enemies, it decreases accuracy, you can't throw grenades, and you can't do melee attacks. Although, you can discard your weapon in your left hand to be able to throw grenades and perform melee attacks.
UNSC Weapons
Magnum- modified from the M6D pistol and has no scope. Duel-wielding.
SMG- a sub machine gun. Duel-wielding.
Battle Rifle- replaced the assult rifle and has a scope.
Shotgun
Sniper Rifle
Rocket Launcher- has homing capabilities.
Frag Grenade
Turrets- a gun emplacement with unlimited ammunition.
Convenant Weapons
Plasma Pistol
Plasma Rifle
Needler
Carbine- covenant battle rifle.
Beam Rifle- covenant sniper rifle.
Brute Shot- a grenade launcher with a curved blade at the end.
Fuel Rod Cannon- covenant rockert launcher.
Energy Sword- a sword that can slice through shields and armor.
Plasma Grenade
Plasma Cannon
Forerunner Weapons
Sentinel Beam- used to control the Flood and seen in Halo first seen in the Library mission when the sentinals were shooting red energy beams at the Flood.
*Vehicles
Except for the Pelican, Shadow, and Phantom, you can find and/or hijack any of this vehicles and use them to kill your enemies.
UNSC Vehicles
Warthog- equipped with a M41 LAAG2 (machine gun) or a M68 Gauss Cannon (rocket launcher).
Scorpion
Pelican
Convenant Vehicles
Ghost
Banshee
Wraith- blue, covenant tank.
Spectre- a covenant dropship and/or light reconnaissance vehicle and holds up to four passangers.
Shadow- covenant dropship and holds up to eight troops or one Ghost.
Phantom- covenant dropship.
*Enemies
Grunt
Jackals
Elites
Drones- fly like creatures that can fly.
Hunters
Brutes- furry giants that have stronger weapons and are harder to kill then the Elites.
Prophets- religious and political leaders of the covenant.
Flood
*Story Line
You play as Master Chief and trys to stop Delta Halo from activating and save humanity. Aslo, the rumors of playing as a Elite is true. You play as a Arbiter, an Zealot that got his "calling", and you have to do multiple missions with him; and he even teams up with Sergeant Johnson and the Marines to help defeat Tartarus( Tartarus is the chieftain of the Brutes and you have to kill him at the end of the game and for reasons you need to find out for yourselves, just so I want ruin the game for those you haven't played Halo 2 yet).
Well that is all that I have. I hope this gives you an idea of what Halo 2 has to offer.
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