I alwarys thought that lighting in PGR3 is good but not very good (GT4 has far better lighting and it runs on a PS2), Forza 2 is really a disappointment from this point of view.
I think we can all be confident that when they show GTV we will view something positivly savage. I don't know why MS would even want to pursue the Forza franchise if it's not going to be top notch quality. The comparisons with GT are too direct. Even at this obviously early stage, I can see that Forza may not be able to put up a good enough showing.