Notch recently gave away his position as lead designer for Minecraft, so he could concentrate on other projects and create new concepts. But first of all he was planning to get a break from it all.
A couple of weeks ago there was a game competition called Ludum Dare. The 'dare' is to create a (free) game within 48 hours. Notch was exited about the competition and long before he did announcements. The game he created was called MiniCraft. It's basically a little Minecraft from a 2D topview and again very addicting. But it was made in a competition, within a deadline, so basically its not allowed to alter any code after.
So the solution? Create another game! See it as a sequel, and better work hours instead of a 48 hour deadline. He's going to call it MiniTale and once he got more info i'll post it asap.
Link to MiniCraft: