Applejax: I read that the rear doors were inspired by passenger jet doors; they pop up, then back, allowing for the roof opening. A very cool idea IMHO, and one that may end up on the next generation MPV (assuming it's not cost prohibitive).
The rear lift hatch plus tailgate combo is also very nice, but echos a few other concepts that utilize similar systems. Cargo utility and versatility seem to be very hot areas for exploration.
Obviously this particular concept is nowhere near production ready, but it does have some nice bits and might signal the direction the MPV is moving toward.