Leaks of an early build for Windows 9 or Threshold have shown up and it looks like they’re bringing a new useful feature to the next iteration of the operating system. Storage Sense or the storage management feature of Windows Phone 8.1 might make an appearance in Windows 9 if you base it of the leaked screenshots of the OS. Storage Sense is meant to make it easier for you to look up what files or apps are taking up the most space in your Windows Phone device. We’re not sure if this will make it to the final cut of the OS but it sure would be handy if it did.
Source: WP Central