Re/code:

Tesla is expected to introduce an all-wheel drive version of its Model S sedan, according to a source familiar with the matter.

Tesla calls this feature “dual motor,” which may answer what Chief Executive Elon Musk was referring to in a cryptic tweet last week.

The Palo Alto, Calif., electric car maker’s co-founder posted an image of a vehicle partially obscured by an opening garage door, alongside the date Oct. 9 and the tease: “About to unveil the D and something else.”

I'm probably a few years away from even being close to being able to afford a Tesla, but I'm definitely interested. And, if they're adding all-wheel-drive to the Model S sedan—as well as including it in the upcoming Model X SUV—it will make for a tough decision. I like the company, and I would feel good about driving an all-electric vehicle without feeling like I was sacrificing anything at all in the way of performance or range. They are gorgeous, technologically advanced, safe, and environmentally-friendly cars.

I would need to do some more heavy number crunching on fuel vs. electricity, but I think my SUV (including fuel) would work out to very similar monthly numbers as a mid-range Tesla model. At least, that's what I'm trying to tell myself.