Apologies if this has been mentioned but it's quite interesting how the back end of the T looks ripe for a rebirth of a 4 seater. The lines look much like the last version so perhaps this is a preview of things to come...
Whilst the lines look close to those of a 4 seater, the tub is standard. The shape comes from panels fixed to the eco-skeleton. I suspect that there has not been any thought put into creating rear seating space.