http://sleepisdeath.net/
Made by Jason Rohrer, known for his "art games" like Passage and Gravitation (mini-games that emphasise vague messages).
This new game is described as a "storytelling game for two players", and looks like a computer-assisted RPG construction kit. One player controls a character who can move, talk and do things with text commands. The other player controls everything else, by setting up the stage beforehand and responding to the other player in real time (or it might be turn based, can't tell).