An early debut of the 2015 A8 would seem to jeopardize sales of the current 2014 A8 and S8 - but the changes are mostly tech and powertrain-based.
A very evolutionary styling A8 makeover on the 2015 models will go unnoticed by most observers, keeping the 2014 cars relevant.
Here are the image galleries of the 2015 Audi A8 TDI, TFSI, Hybrid and W12 LWB models. See if you can tell them apart! (Hint: it is not easy, but the grilles and tailpipes are the best clues.)
2015 Audi A8 - LEDetails
2015 Audi A8L W12
2015 Audi A8 Hybrid
2015 Audi A8 TFSI and TDI - Exteriors
2015 Audi A8 TFSI and TDI - Interiors