Apple's latest flavor of OS X, Mavericks, is just weeks away from landing on customers' Macs, as the gold master has now been unleashed to the developer hordes. Though not a dramatic remake like iOS 7, it'll bring a bring a facelift to such apps as Safari and Calendar, along with better energy management, easier networking, iOS notifications, improved multi-monitor support and more.
Source: http://www.engadget.com/2013/10/04/apple-releases-os-x-mavericks-gold-master-to-developers/
Source: http://www.engadget.com/2013/10/04/apple-releases-os-x-mavericks-gold-master-to-developers/