(And unlike the Kickstarter's claim of Apple-like elegance, this one actually matches the Macbook colors, rather than being the cheaper-looking white plastic.)
"HydraDock USB-C to 12V lighter plug MacBook car charger. There is also nobody making a car charger for the new MacBook. So again, we are. Understand that unlike regular USB, USB-C requires active components — a PC board for circuitry — to accurately comply with the USB 3.1 Power Delivery Specification and deliver the right DC power to connected devices. Our car charger is fully compliant with this specification and will provide years of reliable charging from your car's lighter socket to your MacBook. Without this charger, how are you going to power and charge your MacBook in your car?"
This is patently untrue.
https://www.amazon.com/gp/product/B019G036I2
this was available as early as February.