this video was made by jeux-france.com that seems very good to get exclusive video ...
http://www.jeux-france.com/news21522_gc-demo-de-gran-turismo-5-prologue.html
still better than nothing
enjoy !!!!
(change GT5 to GT5 prologue in the title)
http://www.jeuxvideo.fr/gc-videos-decouvrir-gt-prologue-actu-78733.html
3 new ingame video here
Time to Work !