All of this indeed sounds like awesome news! Hoping this will make Z-Wave JS community grow bigger!
Uwe leads the development of the Home Assistant Z-Wave stick that we’re working on
I would suggest that Nabu Casa include a long (and shielded) USB 2.0 extension cable in the Z-Wave Controller USB dongle package with very clear instructions that users should use it to help place it further away from sources of EMI (electromagnetic interference) if they want to get the best possible user-experience out-of-the-box! 
And of course, don’t forget to add a unique USB product ID to CP210x for automatic USB discovery to make the getting started user-experience even easier for beginners which can attract more people! 
It was by the way also cool to hear that Silicon Labs (who makes the Z-Wave chip it will use) has also partnered with Nabu Casa to support this effort as that shoud hopefully make this the easiest way you can start using Z-Wave devices in Home Assistant: