"To translate the real car into 3D, we use data and assets provided by the car manufacturers, but we also use a scanner that completely digitizes a car. Here's a scoop: We're also modeling the dashboards because you can drive from the interior view in the upcoming Gran Turismo 5."
The in-car view is something that fans have been requesting for a long time, so this should make quite a few people happy. It seems like Polyphony Digital is really pulling out all the stops this time around; this combined with car damage, shows that the Gran Turismo series truly is going next-gen (sorry GT HD -- you don't count). Makes you wonder how many of the changes are because of Microsoft's driving games though. PGR 3 has a great in-car camera, and Forza 2 has damage modeling already and they both have online play. So the Gran Turismo series definitely has some catching up to do in some areas.