I have always loved the GT series, it was the first video game series that I became interested in. It is one of the greatest, but at the same time, frustrating game series. GT5 has been in development for 5 years, what can be taking them so long? When Kaz said "we can release the game at any time", I got excited, I thought the game must be released soon, so imagine my dissapointment when I first heard "March 2010 for Japan", then my even bigger dissapointment when I heard that it has been pushed back to fall 2010. What makes the wait worse is that PD haven't given us a reason for the delays. If PD said "we have delayed the game so that we can add weather/more cars etc.", then I wouldn't mind so much, but we have not heard a peep from them. What PD are also doing is letting their competiton get more profits, a bigger fanbase (some may even be former GT fans) and allow the competiton to get ahead.
I have recently been playing Forza Motorsport 3, and I have to say it is a very good game. If I was not such a big fan of GT, then I would have given up on GT by now. In the time it is taking to release one GT on PS3, there have been 2 Forza's released on 360.
What I'm trying to say is that PD need to stop being such perfectionists and just release the game now. They can add all the cars they want through DLC, and in turn make a tidy profit even after GT5 has hit shelves. I honestly don't think there will be a GT6 on PS3, they haven't even released GT5 yet and the PS3 is already halfway through it's life cycle.