About half an hour after I replied, Sony announced GT5: Prologue at their E3 conference - a PSN downloadable thing (don't know whether it's free, though), with FULL online multiplayer. Being released later this year, and will act as a prologue to the full GT5 game.

EDIT: Here you go, D3V. Some info on it, and a video.

http://uk.ps3.ign.com/articles/803/803512p1.html
http://uk.media.ps3.ign.com/media/85...d_2052343.html