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Apple today seeded the first beta of OS X 10.10.3 Yosemite to developers



From MacRumors:
OS X 10.10.3 includes the much-anticipated Photos app for Mac. The new is available through the Software Update mechanism in the Mac App Store and should be available in the Mac Dev Center soon.
  Apple Seeds First OS X 10.10.3 Yosemite Beta to Developers With Mac Photos App