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Apple today released the second beta of iOS 7.1 to registered developers for testing purposes



From MacRumors:
The update has a build number of 11D5115d and is available via an over-the-air update or through Apple's developer center website. Release notes from the first iOS 7.1 beta indicated that the update fixes network connection issues in addition to other bugs. The beta also included a new Yahoo logo, extra burst mode uploading options for the camera, and an option for a "dark keyboard" in the Accessibility section.
  Apple Seeds iOS 7.1 Beta 2 to Developers