It’s nice to see the Etherwave getting a new version! It would be cool to see the Theremini updated. It’s been 8 years since it was released. Any chance that might happen? 
What I would like to see:
- USB-C connectivity.
- Audio as well as MIDI over USB.
- USB bus power option.
- Battery options (either internal or replaceable). Adding USB-C would also allow external batteries. Being able to be portable would be fun and make the built-in speaker serve a greater purpose.
I’d pay more than the current $399 price tag for these features.