Apple seeded macOS Mojave Developer Beta 4 on Monday. The biggest known change is support for the new 2018 MacBook Pro with Touch Bar models that shipped last week.
macOS Mojave includes a new Dark Mode interface for the Finder and apps, Stacks for organizing files on the desktop, Quick Actions for working with files in the Finder, markup in Quick Look, improved screenshots, Camera Continuity so photos you snap with your iPhone appear in documents on your Mac in real time, group FaceTime calls, and more.
Apple unveiled macOS 10.14 Mojave at its Worldwide Developer Conference in early June. Developers have been testing the OS since, with
macOS Mojave will be available this fall as a free upgrade for compatible Macs.