Is that confirmed? I would buy one *today* if this was known to be true... but I am 80% sure that they don't have any in production; all I see are renders.

There will almost certainly be a WiFi radio (for at home OTA updates) but there will likely be a modem, too, for people that like to remotely manage charge. The modem may be an optional extra and the WiFi traffic is something I can block/inspect as needed.