MacRumors posted a story that Apple today released a new version of OS X Yosemite to developers

The update can be downloaded from the Mac App Store and should be available through the Mac Developer Center shortly. Apple has also released new beta versions of Xcode, OS X Server, and Apple Configurator. OS X Yosemite brings a flatter, more modern look to OS X, with an emphasis on translucency and redesigned dock, windows, and more. It also includes a multitude of new features, such as improved integration with iOS 8 through Continuity, a new "Today" view in Notification Center that offers integration with third-party apps, a retooled Spotlight search with new data sources, and several new features for apps like Mail, Safari, and Messages. Over the course of the beta testing period, each Developer Preview has added new features and refined the look and performance of OS X Yosemite. DP 4, for example, added a revamped version of iTunes with a streamlined design and support for Family Sharing, while an earlier beta introduced a new Dark Mode.

  Apple Releases OS X Yosemite Developer Preview 5