Saw this video today. Never seen it before, although it's posted on youtube in july. Shows the Ferrari California on Nordschleife, Circuit de la Sarthe and many others. Looks stunning! Also showing the driver without a helmet, never seen that before in any GT game!
I think he's referring to the lighting, since its dark in the tunnel, one big hint for me was the GT5 Concept video, notice it starts "at the crack of dawn, and progresses to mid-day(NASCAR) and ends with nurburgring and Top Gear Test Track at dusk, and we've also seen Nurburging in mid-day(in a GT5P test drive) so we know theres probably different versions or more likely, progressive time!