http://wccftech.com/apples-apfs-support-is-coming-to-fusion-drives-in-future-macos-high-sierra-update/

Earlier today, Apple had seen fit to release its macOS High Sierra to all compatible Macs. The new upgraded firmware also brings the Apple File System or APFS to Macs. The change in file system was first introduced earlier this year in iOS 10.3 and was available to all iOS devices. Last week, Apple has updated its support documents in which it confirmed that the new Apple File System would be available for Macs that incorporate a solid state disk. However, this is about to change as the APFS support is also coming to Fusion Drives in the future. So let’s dive in to see some more details on the Apple File System and if they will be available on older devices.

As it has been mentioned that the new APFS support will be coming to the Fusion Drives in macOS High Sierra in forthcoming updates. The information was confirmed by Craig Federighi when he was asked if the new Apple File System will be added later. Federighi said that “Yes, we plan to add support in a future update.”