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The new iMac Pro will ship with High Sierra.
Apple released on Thursday a public preview of macOS High Sierra, the latest updated to the Mac launching later this fall.You probably won't notice many differences in High Sierra compared to the current version of macOS.
Most of the improvements are designed to speed things up. It also supports some virtual reality headsets, something Macs have been missing for years.
If you want to try High Sierra, you can sign up right here with your Apple ID. Just keep in mind it's still an early version of the software and might have some bugs.
It's best to test it on a secondary Mac if you have one. Otherwise, just wait until the final version launches this fall.