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It was certainly foreseeable to all purchasers that Tesla would eventually incorporate driver assistance features like adaptive cruise, blind spot and lane departure. They are already state of the art in ICE cars. Similarly they have been talking about an all wheel drive Model S since the...
After more thought, Elon's use of the word "unveil" leads me to believe it stands for Driverless. Unveiling a concept car that may take years to come to market makes sense.
My guess is a 500 mile range battery for the Model S. D means 500 in Roman numerals.
Double decker battery pack, added cost for the option about $20,000.
I'd prefer D for a Deluxe version that has a luxurious interior that rivals Audi, BMW and MB.