Although not discussed in today’s keynote, Apple is adding a new “universal” filesystem to iOS and macOS. 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. But judging from the initial developer documentation, that’s not going to happen for a few more years. And there’s still much confusion about how APFS and CoreStorage, introduced in Mac OS X 10.7, will interact.
I am pleased to note that CoreStorage, the volume manager in Mac OS X Lion, is much more functional than I had guessed, including a number of undocumented but seemingly functional commands for on-the-fly resizing of logical volumes as well as manipulation of physical volumes.