Polyphony Digital announced at the PlayStation Premiere 2007 event in Japan that the teaser version of Gran Turismo 5, dubbed Gran Turismo 5 Prologue, will arrive in Japan this October, giving gamers a sneak preview of the full game. The release will coincide with the Tokyo Motor Show, scheduled for October 26, but further details on the delivery method, the number of included cars and price were not given.

The official Japanese site for the game is now up, loaded with new screenshots and a new film of the game in motion. The brief video, in 720p, shows off the game's improved lighting effects and physics model but reveals little in the way of radical new features.

Gran Turismo 5 Prologue does sport unspecified interactivity with PlayStation Home, a feature we hope to learn more about at Tokyo Game Show.

Gran Turismo 5 Prologue Official Japanese Site [Playstation.com]