Tesla Motors has decided to offer a 6-seat version of Model X, in addition to the 7-seat setup.
Images of both options from Design Studio were posted on the Tesla Motors Club forum.
There's no price difference noted, so the choice will depend on consumer preferences only, it seems.
The two seats in the second row are captain chairs in the 6-seat layout.
Tesla Model X Gets 6-Seat Option (source: Tesla Motors Club)
Source: Tesla Motors Club