Fresh from the Tesla CEO's Twitter feed (naturally), Elon Musk heralds something called the "D" - coming next week:

Elon Musk's Tweet Du Jour

Elon Musk's Tweet Du Jour

And the picture to go with it:

So what is the "D"?  Our money is on "Dual Motor", check out this NHSTA Model S VIN decoder here (via our friends at the Tesla Motors Club). Now, what is the something else?    One thing is for sure, there is never a dull moment with Tesla.