Tesla CEO Elon Musk has confirmed plans to introduce a Model X prototype in December. Details inside

During an earnings call, Tesla CEO Elon Musk revealed some new details about the Model X.

First and foremost, the executive confirmed plans to unveil a prototype of the seven-seat crossover in December. He added, "So far it's looking good, I don't think anything will cause an issue." Additional information is still limited, but the vehicle will be based on the Model S so expect a 42 kWh lithium-ion battery and an electric motor.

If everything goes according to plan, production will start in 2013 and Tesla will sell 15,000 units annually.