A new image of the new creature - commonly referred to as "Endermen" - was released recently (enhanced here, for light levels). This image is much more up-close-and-personal than the first, giving us a good look at the new creatures. It would seem that wearing a pumpkin prevents the new mob from seeing you, although this is unconfirmed at present.
Additionally, Notch mentioned a possible name-change for the newly minted mob, "Farlander" being suggested and, apparently, already in heavy use.
I find the amount of buzz that sprung up over just the original picture to be absolutely amazing.
FARLANDERS FOR THE WIN
Slenderman is not creepy. Its stupid.
What is so creepy about a guy with long arms and legs, no face, and a suit?
My only other concern about them is that I don't want them to just jump around like a group of retards when trying to move up a hill. It ruins their atmosphere.
No, the point of that name would be that they originate from the Farlands.
Enderman is just a rip-off of Slenderman, which is not even scary.