The tweak will allow you to set certain apps to require fingerprint authentication. For instance, you can set certain apps to not open unless you rescan your fingerprint (Ex Opening Photos will require you to scan your finger again to gain access to the app)
For those wondering how Elias was able to have this tweak work without MobileSubstrate for 64 Bit devices, he claims he is not using MobileSubstrate for injection.
As expected, a tweak to protect applications from launching using your touch id (iOS 7)
For those wondering what the other tweak in the video is, it is called Aquaboard and can be found in the Cydia Store.
Currently there is no word on pricing or a release date for this Touch ID tweak. Obviously this will be iPhone 5s only and available in Cydia.