Interesting thread...
From How to Dismantle an Atomic Bomb, I think they will keep the 'Beautiful Day' track (City of Blinding Lights) and the 'Elevation' track (Vertigo) in pretty regular rotation. I could also see songs like Miracle Drug, All Because of You getting a few plays, as well as The Edge and Bono's favourite, Original of the Species.
As for the other tracks, the songs I think need to be rested but never will include songs like Pride, Sunday Bloody Sunday and Bullet the Blue Sky. I think Chicago has a very strong setlist, but was let down by some of the performances. Bullet the Blue Sky actually got boring, with the 'The Hands That Built America' and 'Johnny's Marching Home Again' snippets. It really did, it became so slow. Compare that to even the Elevation tour version (esp. Slane) and in my opinion Bullet the Blue Sky was frickin' awesome. The solos were just kick ass.
Sunday Bloody Sunday is just becoming very stale. The bridge, where on past tours Bono would get riled up about the revolution, or deaths in Bloody Sunday and sing out all the names of the victims, turned into a lame, slow and boring 'Jesus, Jew Mohammed, it's true...' I just think they either need to rest it for like a leg or 2 (a la Zoo TV) or do something completey different (a la Popmart, with Edge singing).
One, I think needs to be rested for maybe a leg as well, like Pride it has just become the same version, played over and over again. There's no variety. It doesn't help when there's an entire 'cell phones....very powerful...anyone got a cell phone...' speech before it but this song is a very moving, emotional song, but on Chicago it just sounded...flat.
Of the others, Where the Streets Have No Name is integral to the setlist, I don't want to see this song dropped. When I go to my first concert in November, I woudl be very upset if they didn't play this song. Pride just sounds tired, cliched, repititive. New Year's Day is one of those songs that I think sounds fresh most times they play it. I really love watching Adam own those first 10 or 15 seconds playing one of his best bass lines. But that said, I wouldn't entirely miss this song either.
All in all, I think Bullet and Pride are the songs that need a break the most. I would personally love to see some of these songs omitted in favour of Acrobat, God Part II, Hold Me Thrill Me Kiss Me Kill Me, Ultraviolet, Exit, Fire, Drowining Man, Like a Song..., Wire, Lemon, etc...
But we all know the chance of this happening is low because U2 are playing shows to a general audience. About 99% of the crowd at any given show is likely not to be a part of Intereference. The general fans want to see Pride, Sunday Bloody Sunday, Bullet the Blue Sky, With or Without You all played because they don't sit down and scrutinise and pick through U2's recent setlists and analyse perfomances. Like someone said, we're all fucking nuts.