I had a thought today that part of it may refer to lost material.
David's mentioned that he had verses for songs like Draw The Line, Foundling etc which didn't make the cut and we've heard some lines from DTL in exclusive performances before....
He's also mentioned bits about Babylon that he had to loose, even after being very precious about them...
But who knows, can't wait for all the reviews! 
Looking down from the Highrise,
Staring back with your own eyes,
Playing games with the numbers,
Messing around with the dates