Sierra hits Macs on September 20th with Siri in tow
 

Sierra, the latest version of macOS (formerly OS X), will be available to download on September 20th. The update adds Siri to the Mac, the ability to copy and paste among Apple devices, and it enables picture-in-picture, which allows users to pop out...

https://www.engadget.com/2016/09/07/...mber-20-apple/