Today Apple revealed that OS X will be renamed macOS, and that this year's major revision will be called macOS Sierra. Some key improvements to the operating system include the addition of Siri voice assistant, Apple Pay, and remote unlock as well as updates to tabs, continuity, Safari, and iCloud. A Developer Preview version will be available immediately for registered Apple Developers, with a Public Beta expected in July....
Apple Reveals macOS Sierra at WWDC - Available Fall 2016
Apple Reveals macOS Sierra at WWDC - Available Fall 2016