When asked about Apple's U.S. manufacturing efforts during a question-and-answer session with Apple shareholders today, CEO Tim Cook said the company's new sapphire production facility was for a "secret project" that he couldn't talk about



From MacRumors:

Cook did not give any more information, but did say separately that the company is working on "extensions of what we're already doing" and also "things you can't see". He reiterated that secrecy is important because Apple is "getting ripped off left, right and sideways" by competitors. In response to a question about manufacturing in the U.S., Cook pointed to a plant a supplier recently opened in Arizona to produce sapphire exclusively for Apple. There’s been speculation that Apple may use the super-hard sapphire to produce scratch-resistant screens for future iPhones.

  Tim Cook Says Apples Sapphire Facility Is for Secret Project