They didn't go into it,by intention,or by default.Ford Had a concept pickup that did the same thing.I don't recall an explanation for that as well.The Mercedes-Benz IAA has active wheels as well.
Power to the wheel thermosensor could be battery,through a slip-ring,or inductive coupling.
Electric or mechanical power to the louver mechanism itself could be imported through the hub or spindle.Whatever it is,it's pretty clever.
