The title must be referring to the day new Metallica is as good as the old.
I define "The Black Album" as the beginning of new Metallica, and "...And Justice For All" as the end of old Metallica.
The good news is, if the rest of the album is anything like 5:20-end, then I place this album between The Black Album and Justice For All, and call it "The Broken Bridge - New Metallica Attempts Old Metallica."
It's definitely not as riffy and angry as old Metallica, but hopefully it's because it's the ballad like everyone says.
There are a few decent riffs from 5:20-end, and 1 good solo. I'd say anyone who's was an old Metallica fan at any point should at least listen to this section out of curiosity.
http://www.youtube.com/watch?v=-UNfNpjWz-Y