The 1.8 update to Minecraft is now live, and it comes with new modes and new biomes like swamps, oceans and abandoned mines, as well as new mobs and a new health system with stackable food. The update also adds new blocks and new weapons. The 1.8 update also introduces the Endermen, who only come out at night and attack you when you stare directly at them.
Another feature is that the game will now randomly generate villages and houses, but NPCs won't appear til version 1.9. Still, it's nice to have a preview.
Check out Notch's trailer for the 1.8 patch in the video below.