Mobs

Minecraft in itself has many mobs. This includes even more mobs.

Passive Mobs
None yet

Neutral Mobs
Pigman

Giant Lizard

Hostile Mobs
Lava Spirit

Skeleton Knight

Demilich

Metal Slime

Tameable Mobs
None yet

Utility Mobs
Golems

Shulker

Boss Mobs
Skeleton Knight

Golem Lord

Agent of Herobrine

Mob Changes
Pre-existing mobs have experienced some modifications as well.

Bat
Drops 1 Raw Bat Meat and 0-1 Bat Wing upon death. Bats killed by fire drop 1 Cooked Bat Meat instead of Raw Bat Meat.

Shulker
Drops 0-2 Shulker Shell Fragments upon death.