Production of a next-generation iPhone -- commonly labeled the iPhone 5S -- may be delayed, Reuters says. Japanese and Taiwanese supplier sources tell the news agency that 5S production was originally expected to start in June, but that Apple may be encountering manufacturing issues. In particular, one source says that Apple is building a fingerprint sensor into the phone, but having trouble finding a coating material that doesn't interfere. The company is known to be working on fingerprint technology, and some past reports have hinted that the 5S could mark its debut.
