I'm conflicted with this one. Except Popmart, it's been played on every tour for the past 23 years. I'd really only welcome it if it replaced EBTTRT and the band actually got some better mileage out of their multi million dollar screen.
In Vancouver the day after Fallon they did a one-off Bono-Edge acoustic guitar version of this song. No twang singing and no voice distortion. An interesting take, but really only a novelty worth a couple of airings. This tweet doesn't say if it's electric or acoustic, full band or duo.
I LOVE this song, but can't help but being annoyed at the near complete lack of 2015 setlist in-sight into their back catalogue that made the past couple tours so fascinating. Basically, all the "rarities" so far are new songs or just rehashes from the past couple tours. It single handedly re-enforces the notion that U2 are only a singles act and don't have a half dozen GREAT albums.