I hope you won't mind my beginner question: would that have any advantage for a single home user like myself? I mean would it help to do backup easier (I backup my home folder already) and accelerate a restore in case I have to reinstall Linux? Or is it just a seemingly great tool for sysadmins, for some specific use cases?
One important benefit will be, that it discards the key when locking the screen (when integrated in the DE). So the drive is protected when you are not at your machine. The old mechanism only discards the key when restarting the computer. But who shuts his/hers laptop down...
Also on the phone you want probably listen to music, when it is locked.
Gnome plans to add some options like, if you want to use this feature at all or lock securely only after X time after screen is locked. But I think. the implementation hasn't really started yet