I think the prob w/ GT4:M is that they let everyone know about it WAAAAAAAAAAAY too early. They shouldv'e waited until they were halfway done or so.
2080 you say?
IGN.comJanuary 11, 2008 - Sony announced way back in 2004 it was prepping a PSP version of Gran Turismo 4 for on-the-go racing. It was supposed to be an "exact replica" of the PlayStation 2 game. But we haven't received an update on the title since mid-2006, when series producer Kazunori Yamauchi told Famitsu that it was still on the way.
It looks like Gran Turismo 4 Mobile may not ever cross the finish line, though, as an IGN staff member just received a call from GameStop bearing bad news. The retailer says pre-orders of the game have been cancelled -- because the game has been cancelled. By the vendor, apparently.
Well, that's it looks like i won't be getting a new psp, sorry PD, but you've just lost it.
wait until you've seen some in-game material at least...