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9to5 Mac reports that Developer Steve Troughton Smith today tweeted photos of macOS 10.14 with some very juicy details about Apples upcoming operating system.



The OS is very clearly sporting a fresh new dark theme, presumably a toggle-able setting, with the dark UI affecting all application chrome. You can also see an icon for a Mac News app in the Dock, as well as a first look at Xcode 10.
Smith explains that the API the Mac App Store uses behind-the-scenes is including a video preview for Xcode, something that the current Mac App Store does not support.
  Leaked macOS 10.14 screenshots show off new dark mode