Minecraft wiki entry for Development_versions, associated text: Eggs that were removed in Java Edition 1.10-pre2 are re-added, except the cat spawn egg, including:
Wither Skeleton.
Mule.
Skeleton Horse.
Zombie Horse.
Donkey.
Elder Guardian.
Stray: Dark gray with light gray dots.
Husk: Brown with cream colored dots.
Added zombie villager spawn egg.