Who knows how it will end out on record indeed as Ulrich says in the above linked interview with Rolling Stone:
"But while the song sounds fully crafted, Ulrich says things change. "We did the same thing when we went out and played a bunch of dates in 2006," he says. "We were writing and played two different new songs over the course of that summer, and none of them made the record [Death Magnetic]. One was called 'New Song 1' – going out on a creative limb, here – and the other was called 'New Song 2.' That's how deep we went. There was a couple of pieces in 'New Song 1,' some of the middle bit ended up in 'All Nightmare Long,' and the intro bit ended up in 'The End of the Line.' That's how we work; stuff just gets changed around, moved over and this goes over there and the rest of that gets sacked and that ends up in the intro in song five." [Laughs]
"So who knows what's going to happen with this stuff," he says. "But we are off and running and have been creating away in the studio and now we're going to go out and play and sweat and share and we've got some new music that we want to throw everybody's way. And maybe by the time we get to Europe, there will be a different song or different thing or different arrangement. Who knows? We'll sort of take it one step at a time."