Notch has returned to developing his "space game" - 0x10c (0x10^c - Notch's space game
for our previous discussions). He has redeveloped various components and has released a few details.
First here is a video of a test involving the physics of things like player movement and stairs and hanging objects, lighting and a ray-gun (pew pew!).
He also developed a 3d projector that can be used by players and has given the "feature specs" of it in a similar style to previous technological objects. (SPED-3 - Pastebin.com
And the DCPU-16 operating system and interface is still in the game (as you can see in the above picture).