Notch revealed a screenshot of one of the new monsters for 1.8!
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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!
A close-up of one of the huge mushrooms!!!!!
[–]xNotch 1237 points 12 hours ago
That's it, I'm officially naming them "Endermen" as a (subtle) reference to this.