WinFS is not a File System

This story in The Register indicates that in Longhorn WinFS will sit on top of NTFS and is not a replacement for it.
This is a backdown from the original position that WinFS was the base level of management for the file system and NTFS would be an emulated API for backward compatibility.

Maybe it will be in the version after the next version of Windows. I don't retire until 2028, so I still may see it during my working life......