Here's some interesting GT4 news . . .
A few months ago, EGM's Quarterman (who's news is often right but sometimes wrong) reported that the next GT game will feature online play as well as online car purchasing! The plan, according to Quarterman, was for the GT4 team to release a base number of cars with the game (ie on the disc), and have a central server online where they can upload extra cars as they are completed. Presumably, doing so will necessitate the purchase of the PS2 harddrive. Theoretically, this will enable them to make any car ever made available to gamers (within liscencing restrictions, of course). Sounds pretty damn cool to me, but perhaps too good (and ambitious) to be true.