there's a longer entry in the works, but for now, this is exciting. From the NYT Sunday Magazine interview with Jack Black:
NYT: Your next film, which comes out this fall, is called "Tenacious D in the Pick of Destiny" and sounds like a documentary about your band.
JB: No. It's not a rock-you, mock-you-mentary. It is the story of how we came to be, and our first epic journey to become the greatest band on earth.