I think it's fairly hard to say anything with certainty, especially as the new album is still almost a year away (barring a shock early release). We certainly don't yet have anything to assist predictions such as how Bono was fond of drawing a link between HTDAAB and Boy. But hey, I'll give this stab and try to make some realistic predictions (i.e. I won't call the spectacular live debut of Treasure!). If nothing else, it'll make for interesting reading in a couple of years if somebody resurrects the thread.
Boy: I think that Vertigo essentially mined this clean of rarities. A Day Without Me would be a sweet return, but unless the band feel like doing Brick --> ADWM again, I don't see it happening.
October: I think the title track is
always a chance. It's a fan favourite, it's short so it can slot into a set easily (especially in the form of October --> NYD), and it would not be tough for the band to learn. Anything that is not Gloria or October hasn't a chance. I desperately hope U2 prove my last sentence wrong and bust out Rejoice.
War: I don't really expect U2 to try to mine this one, with SBS and NYD already regulars and 40 always floating about. I suppose THBAO is a far outside chance.
UF: I'll call it now - something from this is coming back. The title track would be most likely. Personally, I think Wire would be a welcome return and would go great paired with Twilight.
JT: It's about time for In God's Country.
RAH: Keeping on going with the divine theme, it's about time for God Part II.
Achtung: EBTTRT. Big hit, missed a tour. It'll be back. Count on it.
Zooropa: Stay showed up at Union Chapel and Bono adores it. I'll bet that it comes back. Let's all pray for Dirty Day too.
Pop: Gone remains the most performed Pop song and it damn well better come back.
Non-album songs: The pattern says Spanish Eyes will be back (played on JT, missed Lovetown, played on ZooTV, missed Popmart, played on Elevation, missed Vertigo) but I wouldn't put too much in those patterns. Where the fuck is 11 O'clock Tick Tock? That's what I want to know.
I won't do the latest two albums as they're so recent.