And there’s still much confusion about how APFS and CoreStorage, introduced in Mac OS X 10.7, will interact. But judging from the initial developer documentation, that’s not going to happen for a few more years. Apple File System (APFS) will likely replace HFS+ as the default filesystem for Macintosh computers, iPads, and iPhones and brings a wealth of modern features. Although not discussed in today’s keynote, Apple is adding a new “universal” filesystem to iOS and macOS.