I've been looking around yesterday on Google and I couldn't find that the answer has been totally cracked.
If you have no idea what I'm talking about, this is it: http://en.wikipedia.org/wiki/Love_(The_Beatles_album) (release history, 1st paragraph, last sentence)
So far, I've only found one possible clue: On a Beatles fan site, someone pointed out that cutting out the bottom half (somewhat like Sgt. Pepper's) of the word LOVE resembles the word CODE (http://www.beatlelinks.net/forums/sh...d.php?p=759806). However, it seems unlikely that's what Giles Martin (producer) was aiming for.
I say we work together and try to figure out what this code is