Elon Musk says details on Tesla's Autopilot improvements coming Sunday

Apologizing for delays and an "unusually difficult couple of weeks," Elon Musk tweeted Saturday that he finally will provide more details about promised updates to Tesla's Autopilot program. The Tesla CEO said he will do an hourlong Q&A with reporters, then publish information about Autopilot on Sunday to the company's blog. Musk had said on Aug. 31 that "major improvements" to Autopilot were coming and would be announced that day. But the next morning, a SpaceX rocket exploded in a fireball on the launch pad, putting the announcement on hold. Musk is the chief executive of both Tesla and SpaceX.