There are two games in the current console generation that are best known simply for the fact that they've never seen the light of day: the first is of course Duke Nukem Forever. The second, which has been in development for only slightly less time, is of course Gran Turismo 5. The Prologue version of the game was released in 2008, and although developer Polyphony Digital has promised that the game will be out in time to be the perfect holiday gift, there has still been no announcement of an official release date. So it might seem a bit odd that the head of Polyphony would be talking about yet another sequel, but that's exactly what he did.
While answering some questions about GT5 for Autoweek magazine during the SEMA 2010 trade show in Las Vegas, Polyphony CEO Kazunori Yamauchi stated that Gran Turismo 6 is "already underway". He went on to say that his development team is focused in on finishing up GT5, and he can't really say much more about the sixth iteration, saying, "It took 2,000 days to get all the ideas that went into GT5. It's just too early to be talking about GT6". He also gave some explanation as to why 5 has been stuck in the pits for as long as it has, saying, "[i]t was really to adjust it so it would be perfect".
With rumors swirling that Gran Turismo 5 has finally gone gold, we may be nearing the announcement of a release date. It's also entirely possible that Polyphony Digital will be adding additional cars and possibly even motorcycles as DLC for GT5, which would mean pushing back full development of a true sequel even further. Still, if there is one thing you can say about the developer, it's that they're forward thinkers.