Compared with previous versions of GT, it's a bit strange to have all tracks unlocked from the start. I think there might still be a few more surprises to be found at higher levels that haven't been unlocked.
Quite possible. I remember from GT4 the only way you could tell if there were more was by numbers such as 7/10. So you knew there were 3 to unlock in the category.
Can it be this level thing works the same thing for neat surprises (like new tracks), I hope so!