Okay, here's a few more details on the CA-MiEV:
Mitsubishi CA-MiEV Concept (2013)
The Cd is 0.26 which is ~0.1 better than the i MiEV. And it may have WiTricity wireless charging (as an option?), a flat battery pack with a flat belly pan (as part of the lower Cd) and an 80kW motor. That is a big jump from the 47kW motor in the i MiEV; though no indication if it is front or rear wheel drive.