As for fucking Mercy.... Seriously. What part of U2's past makes you think that a fully leaked song like that is ever going to appear on an album? For those out there fawning over this song as if it's the second coming, you may be very lucky to get it as a tweaked b-side or soundtrack throwaway or something, but the chances of that overblown thing appearing on a proper studio album are about as good as George Bush recording a Zoo Confessional for the next tour "I've made a few mistakes..." They're simply not going to release it now that the horse has well and truly bolted, and I think that's a good thing. Personally, I hope that 1 track out of the blessed 12 or so U2 manage to put out every few years isn't taken by Mercy. You have Mercy now. Why do you want it again? Leave that slot open for something new, hopefully something interesting and good.