Enderman

In a Google+ post, Notch revealed a mob called Enderman. Endermen are depicted as tall, black creatures with long arms and legs. They also seem to have the ability to hold blocks. This could mean Enderman could have the ability to throw blocks at characters causing destruction to a nearby home.

Trivia

 * The name "Enderman" is derived from the internet phenomenon Slender Man, due to the mob's similar looks. Its name was given by Notch in a Reddit thread.