Although it didn’t make the keynote cut, one of the bigger news items for developers today is that Apple is rolling out a new file system for storage for all its products:
The Apple File System (APFS) is the next-generation file system designed to scale from an Apple Watch to a Mac Pro. APFS is optimized for Flash/SSD storage, and engineered with encryption as a primary feature. Learn about APFS benefits versus HFS+ and how to make sure your file system code is compatible.
Details are scant but developers can access information about the new File System here, but it comes with some significant caveats/limitations which will initially limit its usage: