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a file sorting system that can reorganize according to time, category, or a common theme -- such as a work project -- and sync with cloud servers and other users
That's the part that's eluded iWork and iCloud until now - the ability to mix file types. We think of them traditionally as Folders but themes is an equally good if not better convention. Tag files with keywords, as many as needed, so you can group and sort (and search) as needed. Hopefully Apple will not limit this to iWork files but will include PDFs, photos and, well, just about anything.
Big things coming for iOS file system.
Sure hope so. At a minimum it at least shows that they're aware the current implementation is not a long term solution.