It wouldn't surprise me if the long high level brake light never made it past the accountants and I'd expect it to be stuck to one of the rear windows, van style. Also missing from the concept car are the rear doors that open around the tail lamps, though (again) that's no surprise
As an upside (tail lamps aside) it's a good looking estate car and the extra bulk of the rear end matches the front of the R56 very well, makeing it much better balanced car. It would look even better with the rear "pillars" colour matched to the black of glass and the blue of the bodywork. I've tried it with PhotoShop and it works!