guess these are pretty new? Some review/demos on YT:
https://www.youtube.com/watch?v=fUpJHGRkMiM
https://www.youtube.com/watch?v=9EdzJz5X2-c
https://www.youtube.com/watch?v=jo7rQN-x-OE
https://www.youtube.com/watch?v=IMSJOnkUQXA
(one in Japanese)
https://www.youtube.com/watch?v=NqwTIDKqKEQ
Interesting that no special guitar or pickups are required. Looks easy to use from a guitarist's perspective.