Apple has released the Golden Master of OX Yosemite to developers, as well as the fourth public beta to those signed up to the beta program. The latest update can be downloaded by developers from the Mac App Store or through Apple’s Mac Dev Center.
In the past, Apple’s Golden Master releases have been identical to the final versions, and are only delayed if major bugs are discovered that need to be fixed before public release. In most cases, the public version is released with three weeks of the GM going live. The current build may turn out to be the final version of the software, but last ear Apple seeded a GM version of OS X Mavericks to developers on October 3rd, before releasing a second GM shortly before the public release on October 22nd.
Apple are expected to hold an event in late October to announce the release date of the new operating system, which brings a flatter design and simplified user interface elements to the Mac. The design is similar to that of iOS 8, with translucent menus, a redesigned Dock and the same font as the latest iOS.