Apple has released OS X Yosemite Golden Master Candidate 1.0 to those registered with the Mac Developer program, the build number is 14A379a. Separately, Apple released an update for Yosemite Public Beta users, versioned as OS X Yosemite Beta 4, carrying build 14A379b.
Mac developers can find the OS X Yosemite GM 1.0 release through the Mac Developer Center. The GM 1.0 build for developers and Beta 4 for Public Beta users are both available as an update accessible through the Mac App Store. Downloading the delta update through the Mac App Store weighs about 900MB.
Golden Master builds are typically the final version of a piece of software that ships to the public. That Apple has labeled this as “GM Candidate 1.0” suggests that it may receive another update or two before being released to the wider public. Nonetheless, the final release of Yosemite, which is officially versioned as OS X 10.10, should be due within the coming weeks.
Currently, only the Developer Preview release of OS X Yosemite is actually labeled as Golden Master Candidate 1.0. Why the OS X Yosemite Public Beta release is labeled as Beta 4 remains to be seen, since both releases seem to be identical.
Additionally, developers will find Xcode 6.1 GM is available to download.
OS X Yosemite brings an overhauled user interface to the Mac, and includes many new features, including new abilities that aim to improve workflow between a Mac and iOS devices.
Update: Both versions of Yosemite include an update to Bash shell, versioned as 3.2.53(1), to address the Shellshock flaw.