I couldn't find this anywhere on GTplanet. It appears that Gran Turismo 5 has a playable demo at CES and it has 4 playable tracks and 12 playable cars. Here is the link:
http://wot.motortrend.com/6594220/t...demo-edition-more-cars-more-tracks/index.html
http://wot.motortrend.com/6594220/t...demo-edition-more-cars-more-tracks/index.html