Logic would suggest this prototype is an early look at a seven-seat three-row version of the new RX — the rear third of the vehicle is covered completely, including the rear window. There’s obviously something hiding back there.
My attempt to measure this prototype against the existing model was unsuccessful, but even so, differences in size appear to be minor. Is there really enough room back there for a third row?
(Be sure to check out World Car Fans for more photos of the RX prototype.)