Apple released the fourth beta of iOS 8 to developers



From MacRumors:

The update, build number 12A4331d, is available through Apple's over-the-air updating system on iOS devices and can also be downloaded via the iOS Developer Center. Apple has also released Xcode 6 beta 4 and a new Apple TV beta. iOS 8 introduces a range of new features, including improved integration with OS X through Continuity, a Health app, Family Sharing features, interactive notifications, a new QuickType Keyboard and improvements to several apps like Safari, Mail, and Messages. iOS 8 beta 4 includes several new features, like a redesigned Control Center and the introduction of a new Tips app.

  Apple Releases iOS 8 Beta 4 to Developers