If you're one of the 2,781,878 people who own Minecraft, then you have something to look forward to at PAX Prime next month. The upcoming "Adventure Update" will be playable at the Minecraft booth. This update will add NPC villages, random dungeons, a new mob, better farming, critical hits, sprinting, and all kinds of other things that we probably know nothing about yet.
The "Adventure Update" was originally going to be a part of the 1.7 update, but due to the growing size of the project, it was pushed back and made into a separate update. An official release date hasn't been announced yet, but we can assume that it will be after PAX.