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Sometime in late September (most likely) or October. Usually the new version of iOS is released first.
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... faster performance on older Macs.
Not sure what you mean as it's not even supported on older Macs (from 2010 - 2011). You're probably thinking of iOS 12.
 
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Sometime in late September (most likely) or October. Usually the new version of iOS is released first.
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Not sure what you mean as it's not even supported on older Macs (from 2010 - 2011). You're probably thinking of iOS 12.

Mid 2012 MacBooks.
 
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I think next week we will know a little bit more.
If Mojave goes GM some time next week, it is likely the release of macOS Mojave will be somewhere close to the media event september 12th.
 
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How do you mean better performance on older machines? Doesn’t any new macOS iteration make your machine slower and less usable because of older hardware?
Actually that was one of the main focuses on this year's MacOS and iOS updates from what Apple has said. The updates this year are focusing on fine-tuning the systems to improve performance of both Macs and iOS devices, as well as clean up some of the bugs.

Also, it can be a bit of a misnomer to say that all OS updates slow down computers as they get older. While this is sometimes true, a lot of times it is not. Often times newer applications and other content are more resource demanding on older machines, and as a result your computer may seem to run slower. This is because new apps and app updates are designed to utilize the greater power and resources available on newer machines with that older machines don't have access to.
 
Actually that was one of the main focuses on this year's MacOS and iOS updates from what Apple has said. The updates this year are focusing on fine-tuning the systems to improve performance of both Macs and iOS devices, as well as clean up some of the bugs.

Also, it can be a bit of a misnomer to say that all OS updates slow down computers as they get older. While this is sometimes true, a lot of times it is not. Often times newer applications and other content are more resource demanding on older machines, and as a result your computer may seem to run slower. This is because new apps and app updates are designed to utilize the greater power and resources available on newer machines with that older machines don't have access to.
Great to hear that, I knew about the iOS 12 but I'm new to macOS and didn't know about that.
 
I just downloaded "PB10" according to software update but there is no build # on the splash page of "About this Mac", build # 18A389 which is probably the GM
 
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OP wrote:
"Looking forward to the new feature and faster performance on older Macs."

Until you put an SSD into your older MacBook, the "performance" isn't going to get "any faster"...
 
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