There's a few bikes shipping with these as standard (Olympia/Bianci), will be interesting to see if the motors/systems become available to buy separately so you could swap out your Shimano motor when it goes pop.
Electric motorbike Sport | OLI eBike Systems
OLI’s workhorse features a dual-stage internal gear transmission and the most accurate torque sensor in the industry.
www.oli-ebike.com