A couple of weeks ago, Microsoft unveiled yet another SKU of Windows 10, called Windows 10 Pro for Workstations. One of the features of the new version of the OS is that it's built on ReFS, which is short for Resilient File System, and was first introduced with Windows 8.
While the standard file system for Windows 10 is still NTFS, users have always been able to create ReFS volumes on supported hardware, but that's all going away. As spotted by Tero Alhonen, the ability to create a ReFS volume has been added to the list of features to be removed with the Fall Creators Update. However, previously created volumes using the format will continue to function.
Moving forward, this feature will be limited to Windows 10 Enterprise, and you guessed it, Windows 10 Pro for Workstations.
But while existing volumes will still work, it's also possible that they'll lose some functionality. You may recall that Microsoft pushed an update to the OneDrive sync client last month that broke support for anything besides NTFS, and that includes ReFS.