There's a new block called the Dried Ghast that can be rehydrated to form a new mob variant called a Ghastling (baby ghast, essentially), which in turn can become the new Happy Ghast mob variant.

The second game drop from Minecraft this year will include the dried ghast, a new block that can be found in the Nether. These new ghast blocks can be taken to the Overworld to be rehydrated into ...