If you had a lantern equipped in your belt slot you might need to make a new one after this update, since the mods adding that functionality changed.
More options to manage sounds: You can now change the volume of all sounds by mod, from the Music & Sounds menu.
Removed Mutant Monsters since the mod hasn't been updated in a while and there are no means to stop mutants from spawning in certain chunks which breaks a lot of mob farms.
Changed some recipes for Refined Storage so players have to go through some initial Create stuff in order to unlock RS.
Balanced the weapons of the Musket Mod a bit.
Resource packs
Added
Gentler Weather Sounds (optional)
Mods
Added
Mod Sound Volume Options
Structure Credits
Removed
Mutant Monsters
Toni's Immersive Lanterns (replaced by the updated Accessorify which now adds a lantern slot too)
Updated
Accessorify
Bookshelf
Camerapture
Cataclysm
Client Sort
Concurrent Chunk Management Engine
Create Enchantment Industry
Packet Fixer
Simple Music Control (now has a keybind to play/pause the music)
Simple Voice Chat
SmartBrainLib
Storage Drawer
YUNG's API
Recipes
Refined Storage
Modified the Machine Casing recipe to require a Precision Mechanism instead of stone
Heavily modified the Controller recipe to require the Create Mechanical Crafters to be crafted
Configs
Cataclysm
Changed all boss' values to their default ones (apparently the default values got increased during a mod update)
Friends & Foes
Disabled the Mauler (no more deleting your enchanted items by accidentally right clicking it)
Musket Mod
Changed Musket Bullet spread standard deviation from 1.0 to 0.8
Changed Musket Damage from 16 to 13
Changed Blunderbuss Shot spread standard deviation from 2.5 to 3 (making it a bit less viable at greater distances)
Changed Blunderbuss Damage from 21 to 18
Changed Flintlock Pistol Damage from 12 to 9
Structure Credits
Disabled showOnlyOneTime
Added Better Mineshafts to the blacklist (since they would always show up even when you're on the surface)