If you've been waiting for Sony's uber-racing sim Gran Turismo to finally hit shelves again, we have some good news and some bad news. Gran Turismo HD, a souped-up Gran Turismo 4 that was supposed to allow players to buy other cars via the PlayStation Network, has now been reduced to a "concept demo" that will be available for download on December 24th. Sony has instead decided to focus on Gran Turismo 5, feeling that a full-blown sequel might sell better and give their shiny new box a chance to show off what it can really do. However, this new GT won't hit shelves until at least 2008, so if you need to get your racing fix sooner, you're gonna be stuck with the demoted GTHD. Bummer. At least we can still look forward to the PSP Gran Turismo, right?