Your claim makes no sense. We've seen plenty of b-roll footage over the past 12 months. Remember the videos when people were complaining about the aliasing on the back of the car?
Remember the official videos from Sony that gave the location, res/framerate, etc at the beginning? Everyone was talking about the jagged powerlines. You can see the improvements in the beta version and in the latest retail build Youtube videos the jagged powerlines are fixed.
They never used "downsampled" b-roll videos. You're sounding like famousmort when he made that claim about the Driveclub dev or IGN/Neil "forced out". Separate your opinion from the facts if you can't provide evidence.