I thought
this NSK hub motor pretty interesting.
These could be so great for a parallel hybrid on a front wheel drive car, saving interior space. The problem with the motors I have seen (such as QS-motor) is that most cannot rev fast enough with no load. The best QS motor in this regard revs 1000 with no load: a car would be limited to maybe 70 mph without large tire/wheel combos. (I think I understand that correctly.)
I imagine like Proteon, Michelin "active wheel," and other motors, it may never go to market (at least it seems that way with these designs).