Break natural leaves while you ride a horse

Removes baby zombies

Repair elytra with leather (and disable phantoms)

Revamps the core mechanics and removes the bad features

Removes EXP and revamps the enchanting system

Removes Granite, Diorite, Andesite, Tuff

Craft a bed with mixed wool colors

Removes copper, with iron replacing it in the few "uses" it has.

Removes infested blocks

Endermites don't spawn when using Ender Pearls