Notch's twitter feed has been talking about something called an Enderman. I can sort of gather that this is a new mob coming in minecraft 1.8, but neither Notch's twitter account or his blog contain anything substantial in the way of explanation.
What (or who) is an Enderman?
Best Answer
Notch first disclosed the existence of a new mob in development on his Google+ account in a screenshot. He gave no information other than it was "creepy".
The screenshot was immediately enhanced and posted onto Reddit, where a commenter suggested the name "slender man", a popular meme: Notch liked it and decided to use a variation of that name, "Enderman".
After days of speculation and idea generation on Reddit and elsewhere, Notch decided to use some of the more popular ideas to define what the mob did, and described the Endermen's behavior on his Twitter account:
Later, Notch went into great detail about what he is trying to accomplish with the Endermen on his tumblog: