Apple has decided to test out device migration to the Apple File System (APFS) in a beta release of iOS 10.3 which marks the beginning of Apple’s move from HFS+ to APFS. Ultimately, it plans to move Macs , iPhones, iPads, iPods, Apple TVs, and Apple Watches over to the new file system eventually.
Devices which upgrade to iOS 10.3 will have their file systems automatically converted to APFS and the limited interaction the user has with the file system on such gadgets (iPhones, iPads, etc) means Apple can roll out the file system in a controlled manner.
