-Maps
Lone Wolf more playable: Dropships won't spam the turret gun at you from far away. AI can't see far away and therefore won't snipe you through the fog.
Sword Base has some extra enemies

-Weapons
New weapon: BR55 PARA (battlerifle chambered in pistol round)
Changes to weapon sandbox, balancing.
Changes to some sounds.
Warthog chaingun sound and FX changed, AI are more accurate with it.
Warthog gauss gun more accurate in the hands of AI. Does a lot more damage.
Warthog rocket launcher projectiles no longer spin around wildly in flight.
Sniper is 1st Person now.
Needlers are less damaging against your shields, but deadlier when shields are down.

-Characters
New models for Troopers, ONI, UNSC Navy Security Forces, and Civilian Militia.
Most Troopers on Exodus and New Alexandria will have different camo, gear, and insignia for the theme of them being a different "division"/unit.
Elites have new dialogue, should be more vocal with more variety of sounds.