Adventure

Notch said that Minecraft version 1.7 will be the Adventure update and that it will be similar to some of the rumors that had been around.

Notch is now working on adventure mode.

Formerly Dungeons and Levers Mode, Adventure Mode is an upcoming game mode. It is expected to be something along the lines of Notch's previous work where he had made a game similar to dungeons and dragons when he live streamed some of his programming. (Link Unavailable)

Features

 * Will have programmable tiles, such as doors, pressure plates, and levers.
 * Possibly not being able to place or destroy blocks
 * Numerous randomly generated dungeons.

Speculation

 * Goblin villages?
 * Teleportation tiles?
 * Keys?