Alright, I've scanned through the whole thing. Main interesting features:
* Memorized Spellcasters can change 1 spell per long rest (must be the same level as what you replaced; includes cantrips)
* Prepared spellcasters can change 1 Cantrip per level up
* Most spellcasters get new spells added to their spell lists
* New Fighting Style for Paladins and Rangers to get Cantrips from the Cleric and Druid lists, respectively (change 1 per level up)
* New Fighting Styles for martial classes
* Significant Monk enhancements