Rifleman
Now owns 2 Model S's!!!
It looks like it is more of a case of "has 5 seatbelts" than "can seat 5". The one big plus is that it should be possible to put a rear facing car seat between the two front seats. This has been a major issue for first gen volt owners with small kids, as modern car seats are huge, and dont fit well behind the passenger seat unless it is pushed all the way forward.