According to Business Insider, an unsolicited Apple employee emailed to say that a group at Apple is working on a project that would "give Tesla a run for its money." For this to be true, it means that an Apple employee either broke Apple's strict rules for secrecy in some obvious way that makes Business Insider believe the email actually came from an Apple employee, or that it was some sort of vague and intentional leak from Apple, sent straight to Business Insider.