
Now Notch has taken that feeling I got when I first saw Minecraft and made it 100 times bigger with his next game idea:
http://0x10c.com/
From what I can gather its one persistent multiplayer universe (single player will be an option I believe) where you design and build your own ship and explore a huge (effectively infinite) environment where you can land on and explore planets.
On top of this, the most interesting feature of this game is that you can use simulated 16 bit computers in game that you can program to control your ship etc
The website explains all of this better and will be following the same development mechanism as minecraft did (i.e Alpha release) and yes I will definitely be buying the game in it's alpha stage

COMPLETELY UNRELATED EDIT: Oh yeah and on top of all this I got into the beta for Duolingo today

http://duolingo.com