Over the years, Tesla CEO Elon Musk has attempted to drum up excitement for the company’s new endeavors by teasing them on social media, promising to soon unveil something “major,” like last summer’s worst kept secret: that the company would begin making solar-based batteries for homes and businesses. Well, the hype-loving CEO — who could use a boost after the last couple of weeks [link to an autopilot story]– is at it again, teasing a “top secret masterplan.” [More]