Tesla's "We, Robot" event left analysts with more questions than answers.Wall Street was broadly disappointed by the lack of detail, and skeptical of Elon Musk's timeframes.The EV maker's stock dropped as much as 10% in early trading on Friday.

Ever the showman, as well as one of the most successful entrepreneurs of our time, Musk used a Warner Bros movie lot to show off a prototype of what is now being called the Cybercab. This version was a sleek, silver, two-seater without the familiar steering wheel or pedals of a traditional car.

Tesla has entered the robotaxi arena. CEO Elon Musk on Thursday unveiled the company's autonomous Robotaxi vehicle during its We, Robot event at Warner Bros. Studios in Los Angeles. The car shown off is of a silver-chrome hue and features no steering wheel or pedals.