My favourite feature is the Totem of the Undying. Hoping that it inspires Mojang to give us stronger monsters, armour, weapons, and bows to justify its existence, since diamond armour has been the best gear since forever and isn't rare anymore anyways. How cool would it be if we had a sea serpent boss that dropped a helmet that grants full underwater mobility, oxygen, and ordinary mining speeds, or a rare, unbreakable mesa dungeon filled with stronger variants to all mobs currently in the game, with obsidian, ranger and assassin armour at the end of it?