Apple released iOS 7 beta 3 today to developers, hopefully bringing some new features and bug fixes to the next version of Apple's mobile OS. Apple is on a two week schedule thus far, with beta 2 arriving two weeks after iOS 7 first became available to developers and beta 3 arriving two weeks after beta 2. The latest version is available over-the-air via Settings > General > Software Update on devices running the current iOS 7 beta.
Hat tip to F. Rizzo for the email
Apple iPad Air 2
Apple iPhone 6s