The two companies that Apple is relying on for sapphire material, Synopsys and Bern Optics, have recently expanded their production facilities. Both provide the material for the rear camera and the TouchID fingerprint sensor on the Apple iPhone 5s. Apple is believed to consume 10% of the world's manufactured sapphire and the expansions seem to indicate further use of the material by the Cupertino based tech titan.
Apple CEO Tim Cook, during an interview broadcast on ABC today, confirmed that the company's new facility in Arizona will be used to produce sapphire glass that could be used for future iPhone models, or for the expected Apple iWatch.
source: AppleDaily (translated) via AppleInsider