Musk on Twitter:
The Bat Computer says the III is the sedan, and the “more adventurous” version is the Y, a crossover, with falcon wings. Hey, the R/D is already done for those wild n’ crazy doors. Why not get more mileage out of the technology? Yes, very clever Mr. Riddler. The S and X will each have a younger sibling, so to speak, and you will finally complete the word S-E-X-Y in your product lineup — all part of your twisted sense of humor.
So the Y will have three rows, eh, to justify the falcon doors? Or maybe that’s what you want us to think . . .