Tesla's Elon Musk has another 'top secret masterplan' - Roadshow

Tesla CEO Elon Musk has signaled that a new major project is in the works, but the electric-car maker isn't quite ready for an unveiling.

Musk tweeted Sunday that he's "working on Top Secret Tesla Masterplan, Part 2. Hoping to publish later this week."

It wasn't immediately clear what Musk might be working on. Follow-up tweets didn't mention the masterplan, and Tesla representatives did not respond to a request for comment.

Musk's tweet is reminiscent of a 2006 blog post titled "The Secret Tesla Motors Master Plan (just between you and me)," in which Musk described his company's production goals and hinted at the cars that became the Tesla Model S four-door family car and the Tesla 3 sports sedan.

Musk has been under pressure for the past couple of weeks since it was revealed that the National Highway Traffic Safety Administration is looking into the design and performance of the Autopilot system on the Tesla Model S after announcing the death of a driver in which Autopilot was engaged. The Palo Alto, Califoia, company, also announced that the number of vehicles it delivered to customers in the second quarter fell well short of its own expectations.