Meet macOS: Here's all the ways your Mac will completely change this fall

At its annual Worldwide Developer Conference on Monday, Apple announced macOS Sierra, the next version of its computer operating system for Macs shipping this fall as a free update. It'll be available as a developer preview in July. SEE ALSO: At WWDC, will Siri live up to its promise? With macOS, Apple now has all of its operating systems for its various devices all tidied up. Auto-unlock is one new feature that lets you automatically unlock your Mac when it detects you're wearing your Apple Watch right near it.