Head

Heads are decorative blocks that were shown by Jeb. There are five variants of heads: skeleton, wither skeleton, zombie, human and creeper. They will be very rare drops of these mobs.

Use
They are used mainly as a decorative block. It can be placed facing in 16 diferent directions, a useful feature, and also in a frame.

It is possible to spawn Withers by placing 4 soul sand in a T-formation then placing three wither skeleton heads on the top.

Also, you can wear them on your head, just like pumpkins. Unlike pumpkins, they only replace the first layer of your head. This means that if your skin has a second head layer, it will render over the worn head.