Version 7.9:
Added Halo CE inspired reticle for AR, H2A reticles for Magnum and Carbine
Modified materials on Scorpion, SAW, Railgun, & Covenant skin
Adjusted Cortana's appearance
New major rank for Watchers
Edited Knight energy blades to show their color before the Didact wakes
Adjusted fire rates on enemy Suppressors & Lightrifles
Adjusted NPC grenade velocities
Adjusted player Plasma Pistol fire rate
Added a few enemies and changed some encounters on Forerunner, Reclaimer and Midnight
Fixed broken Watchers on Midnight
Tweaks to help dialogue clarity
Tweaks to Suppressor projectile tracking
Tweaks to Watcher resurrection properties
Cutscene lighting improvements
Added Knight ranks to tower cutscene on Requiem and the cliffs at the beginning of Forerunner
Added General Elite to Didact cutscene
Changed the Knights in the Librarian cutscene to their final appearance
Added new enemy ranks to Spartan Ops levels
Removed a couple unnecessary objective waypoints
Many script and bug fixes & more I probably forgot

Fixed in-menu campaign description

7.9 preview:
Small fixes
Tweaks to help dialogue clarity
Tweaks to Suppressor projectile tracking
Tweaks to Watcher resurrection properties
Changed the Knights in the Librarian cutscene to their final rank appearance

Hotfix for final grav lift not appearing on Midnight

7.9 preview:
Added Halo CE inspired reticle for AR, H2A reticles for Magnum and Carbine
New rank for Watchers
Added different Knight ranks to tower cutscene on Requiem and the cliffs at the beginning of Forerunner
Added general Elite to Didact cutscene
Edited Knight energy blades to show their color before the Didact wakes
Adjusted fire rates on enemy Suppressors & Lightrifles
Adjusted NPC grenade velocities
Adjusted player Plasma Pistol fire rate
Added a few enemies and changed some encounters on Forerunner and Midnight
Fixed broken Watchers on Midnight
Script and bug fixes

Was there another MCC update or did I forget to actually increment the version number...

Version 7.9 preview:
Feb 14 update support
Minor bug fixes

Version 7.8.1:
Reverted all modified sound effects back as they will probably cause more problems than they're worth in the long run
(For now use Halo 4 Rescored by GruntyGunner if you want alternate sound effects, it's a great mod)
Script bug fixes on Infinity