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The French app store let the High Sierra release notes slip a little early, suggesting that the most recent beta is extremely close to release and will include official support for external GPU technology.
First spotted by French site MacGeneration, the notes summarize what's already been spotted in the beta, for the most part. The biggest addition is the launch of official eGPU support which saw a dramatic cut-back in beta 5, by disallowing older Thunderbolt 2 machines from using the technology.
The new High Sierra 10.13.4 now incorporates Messages in iCloud, a feature that synchronizes a user's Messages "stack" between multiple devices logged in to the same iCloud account. High Sierra 10.13.4 is also the first one to warn users that they are running 32-bit apps. Apple has previously stated that High Sierra is the last Mac operating system that will run the older apps "without compromise."
Beta 2 also changes the name of the iBooks app to "Books." It appears to be mirroring the rebranding, and potential re-design, of the app on iOS, but a timetable for changes beyond just the name aren't clear.
Other additions noted in the release notes include the launch of Business Chat in Messages in the United States and Canada, resolution of a graphical corruption issue with the iMac Pro, and a fix for Messages being listed out of order.
The English language release notes remain essentially non-existent.