Apple quietly released a fourth beta of iOS 10.2.1 to registered developers late in the day on Thursday. The new beta features a build number of 14D27 and eliminates virtually all of the “known issues” in the release notes, suggesting that a public release is imminent. The single listed issue remaining simply notes that the Emergency SOS feature which debuted in iOS 10.2 continues to only be supported in India, which appears to be a test…