A couple of years ago CrunchTime Games Inc shared the Pitch Document and 60 Seconds Of Gameplay Document for their XBLA game Shred Nebula. These documents can still be found on their website.
According to the author James Goddard: “What makes these documents special is the way they are created, using a technique I call “Visual Game Design” that I was fortunate enough to adapt over the years, reflecting on experiences of working with the Japanese early in my career.”