We just had out test drive for Model X with the entire family and we thoroughly enjoyed the test drive. When I asked about the availability of Model X with 5 seat configuration, the tesla employee who was giving us the test drive mentioned that Tesla is working on foldable 2nd row seats and waiting to finalize that. He seemed to suggest that foldable 2nd row seats will be only available in 5 seat configuration and will be like a flat bench (?like Model S). 6 & 7 seat configuration will continue to have mono-post seats that do not fold flat. Not sure if this was already mentioned on the forum before but wanted to pass it along.