The single edits of "Barbarism Begins at Home" and "Last Night I Dreamt That Somebody Loved Me", "Jeane", the original live "Handsome Devil" recording, the New York version of "This Charming Man", "Wonderful Woman", a live version of "Meat is Murder", the Troy Tate version of "Pretty Girls Make Graves", and "What's the World". None of them are available on official album releases.
And all of them here apparently remastered by Johnny, along with a shed-load of other songs.
This is, quite comfortably, the best "Best Of" release for The Smiths, and it's also better than any "Best Of" Morrissey has ever come out with. Compare it to this year's joke of a
Greatest Hits. Nine songs which are not available on any albums, a couple which (as far as I know) have never been oficially released on CD, and a digital remaster overseen by Johnny Marr.
This one is genuinely worth the purchase.
You're trying to work out MozLogic. Therein lies madness.
Edit:
Another report, indicating that the information on Morrissey and Marr's involvement comes directly from Rhino - it isn't the NME making it up.
http://www.clashmusic.com/news/smiths-compilation-due