GT4 will NOT be online however, those of you that may be framiliar with XBOXconnect, there is apparently a computer program either done or almost done that will do the same thing for GT4....

if you dont know about XBC then this is the short of it:
need a router attached to ps2 and PC... the program fakes the PS2 into thinking you're playing a LAN game with someone else inthe house even tho they could be in california or whatever.... it will prolly have high lag, dunno how bad tho.