Not all levels were compiled for the new changes - just the ones mentioned below

Maps:
-Updated Valley map - lots of Covenant vehicles, jackal sharpshooters/grenadiers on ridges
-Courtyard, Park, and Overlook are setup for PVP versus. Elite character should have better camera and movement.

Weapons:
-Updated Covenant weapons with proper gun mechanics and accuracy.

Weapons:
-New weapon: RPG with homing missile
-New weapon: Semi auto shotgun. (Weaker 12 Gauge caliber vs. the regular Shotgun's 8 gauge)
-New firing sounds for Covenant weapons
-Rocket launcher projectile speed increased, removed tracking
-Regular shotgun does more damage

AI:
-Marine and Covenant AI accuracy/firing patterns adjusted more
-Spartan variants updated with more variety and consistency

Maps:
-Unearthed, Park, and Outpost made more apocalyptic.
-Less friendly AI on Unearthed

Lots of misc changes.

-New weapon: MA37 with underbarrel grenade launcher
-Overhaul of Marine AI accuracy
-Balanced Covenant accuracy for certain variants
-Added new Elite variant based off the Specops/Strike team from Halo CE
-Adjusted suppression FX to have less motion blur
-Adjusted weapon sound distances/fade
-Balanced player accuracy for some weapons, especially the pistols which are useful now as a sidearm
-Skirmisher health lowered
-Specops grunts lay down a lot of suppressing fire and will throw lots of grenades in CQB
-Grunt Ultra will overcharge plasma pistol whenever possible

-Adjusted suppression mechanics.
-Grunt Ultra, Grunt Specops, and Elite Ultra have unique firing patterns
-Mounted MG is now 1st person view with new crosshair
-Experimental changes to Specops grunt: moves very fast, throws grenades a lot in CQB (AI might be a little broken and needs to be adjusted next update)
-Added more cover and MGs to Park, Overlook.

Main update:
-New suppression mechanics. Blurry vision and crosshair fading out the more you get suppressed.
-New Marine models. Player appearance is randomized on each spawn

Minor updates:
-Fixed player using jog animation instead of walk when moving forward while aiming.
-Improved player movement to be more smooth
-Fixed some problems with the 3rd Person camera being slow when crouching/standing
-Fixed DMR accuracy being bad
-Player health modified - would be smart to test your damage resistance setting to see if it's still balanced.
-Messed around with Covenant weapon sounds and explosion sounds and their attenuation distances. Less eardrum damage for you.
-Lots of little misc changes

Overhaul of all UNSC weapons:
-Aiming down sights will make the player walk. You can fire with more accuracy than running.
-Bullet ballistics/drop added to all human weapons. Noticable on maps like Valley.
-New crosshair for DMR and Sniper
-Mouse is slower when aiming with weapons with higher zoom to allow more precision.
-Crosshair on grenade launchers has been lowered on the screen to account for trajectory - you will have to factor that in firing at targets very close

AI:
Enemy accuracy balanced on some weapons. No more laser accuracy with the fuel rod.
Wraith mortar more inaccurate
Insurgents balanced - lower health
Trooper/Marine AI have lower health

New weapon:
-SRS-99 suppressed (sniper rifle with silencer)

New weapon: M247 GPMG

Increased player turning speed
Increased player evade speed
Lowered player grenade throw velocity

Modified Elite AI: more cautious, crouch more
Marine AI improved: more cautious, crouch more often and move while crouched
Grunt AI: grunts can panic more

New weapon sounds for mounted MG
New, unique weapon sounds for distance/far away weapon fire sounds for every weapon

New crosshair for some weapons

New weapon: MA2B (Short barrelled carbine, 28 round magazine, good for CQB). Pistol PDW variant is now on all maps.

New elite variant based off the Elite Major from Halo CE.

Silenced MA37 now has decent accuracy.

New weapon: pistol in PDW variant (full auto, extended mag with 22 rounds, and stock) Currently only on Village and Nightclub maps

Added more cover to Nightclub and Village

Reduced the amount of ODSTs that follow and respawn on nightclub to 3. There's still some extra starting ODSTs that don't respawn.

New map where you fight against insurrectionists "Village"

Some weapon tweaks (only takes effect on the new map until I compile all the maps again next update)

Removed campaign maps (Will probably add as a separate mod in future)