It is way past 1 a.m. Thursday morning on the West Coast but that means nothing to Tesla Motors' owner Elon Musk who just released additional details of the latest updates to the company's autonomous vehicles. Musk also said that retrofitting existing Tesla cars with full self-driving hardware is both difficult and expensive, making it cheaper and simpler to buy a new vehicle instead. Another cool feature is the new "Summon" button available on the Tesla smartphone app. In a move reminiscent of the Batmobile, tapping that button will literally send a signal to the car, which will drive itself to wherever you (and your phone) are.