I could easily see PD restraining what you could do with a course editor, especially with all of the posts in this thread already. How many people would recreate a real world track and name it exactly that? They better get their lawyers to write up a pretty good disclaimer.
Nobody knows, but it's very much possible we can lay down our own tarmac, as in Toscana, Eifel and Mt Aso in GT5.I really doubt that you can recreate anything. I think they recreated the city and surrounding area and most likely you can use the roads they already laid out.