Elon Musk on Wednesday introduced a second master plan for Tesla, a follow-up to the vision he shared 10 years ago. The original master plan is now in the final stages of execution, he said. The refresh sketches out a multiyear, four-pronged strategy that is about more than vehicles. Musk also plans to advance an integrated solar-roof-with-battery product, create a ride-sharing program, and further develop the Tesla autopilot technology. Investors seemed unimpressed -- Tesla stock fell Thursday following the announcement.