48v has a number of benefits. You don't need special shielding and it's easy to step down to 12v for accessories. It's a very common voltage in the solar and e-bike space so there are lots of standardized components at commodity prices. Most nominal 48v packs peak at 54.6 volts IIRC.
Pricing is about where I would have expected. It will be a very hard sell in North America, of course, but I'd still love to see other attempts at this type of drivetrain. Just like electric cars, it's a much better fit for the luxury end of the market than the cheap end, but OEMs in the early days just wanted to confirm their biases with $40k penalty boxes that competed with $14k economy cars. A hybrid Goldwing could be a very interesting proposition, but who knows when someone with the resources to do it right will be willing to take the risk?