"Hi, I'm Notch, and this is my new game. It's going to be a space game, and it's quite ambitious!" The game will be an MMO -- possibly with monthly fees -- and include "a fully functioning emulated 16 bit CPU that can be used to control your entire ship, or just to play games on while waiting for a large mining operation to finish."
Bullet point list of things they want to include:
Hard science fiction.
Lots of engineering.
Fully working computer system.
Space battles against the AI or other players.
Abandoned ships full of loot.
Seamlessly landing on planets.
Advanced economy system.
Mining, trading, and looting.
Single and multi player connected via the multiverse.