See https://www.superpedestrian.com/
They say they've got an exclusive contract with MIT for the technology and rights to produce Copenhagen Wheels
It's a 350 watt (or 250 watt in the EU) electric bicycle hub motor design. It has a built-in 48 volt battery pack, but don't give the amp-hours capacity. The range is said to be 31 miles. It supports regenerative features. It's available in either 26 inch or 700 cm wheel sizes. It works with both single speed and 9/10 speed hubs.
The introductory price is $699, and after the first 1000 are sold it goes to $799.
That price is comparable to other kits .. e.g. the e-bike-kit is IIRC about $300ish for the motor/controller kit, and another $300ish for a battery pack.
The Copenhagen Wheel also supports Bluetooth for control via a smart phone.
