A deluxe version of Songs Of Innocence will be released on October 13th. The news release says it "will contain an acoustic session of select songs from the album plus four additional tracks: Lucifer’s Hands, The Crystal Ballroom, The Troubles (Alternative version), Sleep Like A Baby Tonight (Alternative Perspective Mix by Tchad Blake).
U2 and Universal Music Group will face some hurdles due to disgruntled retailers. Sources say Target has a policy of not carrying any title that was first released to digital retail. Target refused to initially carry Beyonce's self-titled album following her surprise iTunes exclusive, and Amazon withheld the usual prime page placement. To entice retailers, Universal is offering four tracks that iTunes will not have until November, according to sources. Some retailers could walk away with more tracks, as sources say Universal has three additional tracks for select retailers.
That was the first I saw of that mention. Would be cool though!