Elon Musk in ep 1/11 and not a "kiss ass" celebrity guest star turn: Burns tries to kill him, and we reveal Musk's master password.- Al Jean (@AlJean) July 29, 2014
According to Automotive News, Jean first announced the episode during a panel at San Diego Comic-Con. It's titled "The Musk Who Fell to Earth" and has Mr. Burns somehow losing all of his money to the Tesla boss. With his name prominently in the title, it gives the indication that Elon's role is going to be a lot bigger than just muttering a few lines in one scene and then walking away.
This is technically Musk's second appearance on The Simpsons. An earlier episode featured Elon Musk as a fragrance of the fictional ASK Body Spray. Tesla put up a screenshot of it on their blog and said, "You know you're famous when you get featured on the Simpsons." Apparently, the CEO is an even bigger deal now with this guest-starring gig.
Of course, The Simpsons has made at least two, great contributions to the automotive world – the Homer and the Canyonero. Our only hope is that Musk can somehow feature EV versions of them both in his episode.