I got GT6 for Christmas, and got to spend an hour tonight playing it. I have a few things to say about it.
1. I have a Honda Fit. I didn't want a Honda Fit.
2. They made the menu even harder to understand. I'm sure it was hard to come up with a menu concept both harder to understand the GT5, and more difficult to navigate as well, but they did it.
3. I drove the GT500 for a bit. Damn, that thing is overpowered.
4. Everything looks and feels like GT5, but just a little bit better everywhere.