Very interesting. In comparison to Tesla, I see those differences:
PRO:
- Faster "Charging"
- Some more range
- Even greater acceleration
CON:
- You have to put the energy into the electrolyte liquid first/recycle it (additional step, that is really the charging but it would be done outside the car); this adds a lot of extra overhead
- Huge logistical effort to put up fueling stations compared to chargers
- Can't just charge at home
So I don´t think this will pose a threat to Tesla. Performance is great, but range is not that much higher and the acceleration comes at the price of a lot more complex drive train (addition of supercapacitors, individual engines on each wheel - could do that for a Tesla too, really) which I don´t think will ever be able to compete economically, at least not on a mass market car (Model E).
Unlike the Tesla concept (start high end, work your way to mass market), this would really be contrained to high end cars which would make the installation of a comprehensive infrastructure even less likely.