The final cut of the 9th episode of the Tesla Motors Club Podcast, featuring Chad Schwitters, the former president of Plug In America, is now available. You can watch it now on YouTube or listen to it on all major podcast networks.
...uuuuh, not true. many older Model S do have the 12V wiring and connectors under the headliner. Not sure if the new Model S sun visor has the matching connector to the old one. For sure in my 2012 S I have the connectors. I could not find them on my wife's 2015 S. Search TMC for threads on the subject, and look for posts by herbie in NL who runs an aftermarket business.
Herbie is doing a retrofit of your mirror. But I am exploring the idea of buying current production visors from Tesla and installing them--hopefully less $$ than Herbie and made with the proper connector. The problem is matching the headliner-I would assume all current visor production is not Alcantara.