Too many changes I didn't note down, but here's an unorganized list of the ones I did:

Added playable Elites to Multiplayer (must be wearing Dare in ODST)
Voice lines for the Grunts, Marines and Sgt. Johnson have all been replaced with their Halo 3 versions (Including all supported languages)
Fixed Bloom pop-in on Dangercanyon when traversing between the interior and exterior sections
Updated the water shader and cubemap for the center pond on Dangercanyon
Regenerated all cubemaps to be 64x64 to save on space and performance
New elite models (by Jordanspartain & N8endo)
Updated Masterchief shaders for Campaign & Multiplayer
Sentinel Aggressors should no longer drop the incorrect Sentinel Beam in Firefight
Fixed Plasma Pistol using the wrong left hand marker
Fixed Captain Keyes not lipsyncing certain lines on The Truth & Reconciliation
New heightmaps for variety of shaders
A bunch of animation fixes
Fixed black bars not appearing on the first & final cutscene on The Truth & Reconciliation
Added dialogue to Masterchief when killing enemies using a Shotgun in Firefight
Fixed AI not patrolling on the first section of The Truth & Reconciliation
Added Sound Effects for when enemies land on the gravity pad on The Truth & Reconciliation
Added dialogue to Captain Keyes outside of cutscenes
Human Weapons will no longer damage Covenant Shield Covers
Added a vibration effect when on low health (Campaign Only)
Added physics to the Shade Turret

... and so much more.

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To see the changelog, please head over to the discussions page and click on the Patch Notes thread.
https://steamcommunity.yuanyoumao.com/workshop/filedetails/discussion/2899334556/3808406410973461541/

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