It's not about creating new filesystems, but using filesystem ui to browse any filesystem like hierarchy. For example using a potential implementation you as a user could be browsing S3, remote NFS, or gmail account where labels would be represented as folders and emails as text files.
This was a big deal when gmail was first announced and they said they would give away one gigabyte (!!) worth of email storage with every (free!) account.
These days, dropbox, drive and many other similar services provide a much more straightforward mapping to a storage service.
