Notch revealed a screenshot of one of the new monsters for 1.8!
Seen here is a screenshot of a new monster in the works for 1.8. While Notch didn't specify exactly what it was, it seems fairly apparent that this new arrival in Minecraft isn't especially friendly-looking. What is it? What can it do? We will keep you updated as this information becomes available!
Update - Thanks to Nyanners and KSMF, respectively, for the following two enhanced images!
Thx For The Guy Ho Got These Photo, He deserves
These creatures are most likely hostile (pretty obvious) and that they can interact with the environment. Whether it is to place or remove blocks, they still make me think of "hostile griefer bots."
Also, I don't think those things are not DIRECTLY hostile, and that they just mess up a portion of the world (targeting maybe common building materials). The reason why I think this is because none of the creatures seem to stare at the character playing (unless he/she is using noclip of something).
Notch is probably one of the only people that reveals things at the right time. He just caused me and everyone else to speculate what is going to be released.
BTW if they throw blocks at you by picking them out of whatever they can find, then beware. THEY WILL DISMANTLE YOUR CONSTRUCTIONS block by block
Everyone, notch revealed the name to be endermen.
Oh, wait- DEMENTORS WITH BLOCKS!
THEY ARE CALLED ENDERMEN
Or he's outside the sight of the mobs, like all mobs will not notice you until you get near them.