Japanese accounts) can rejoice. A demo for Gran Turismo 5 Prologue is coming to the Japanese PlayStation Network on October 20. Given the futuristic nature of the country (it's currently early morning Friday), that's less than 24 hours from this time of publication.
According to the press release (via Rocket Punch Auto Blog), the trial includes seven cars and one course (Suzuka). There is no online play but single-player races for up to 16 cars. Video service Gran Turismo TV will also be included with reports from 40th Tokyo Motor Show.
No word on a demo release outside of Japan. GT5 Prologue is due out