Aardvark747 said:
Hadnt even thought about that! You're probably right there. It wont be Walk On surely, it'll be something different - but dont they normally end with something from the latest album?
Actually, no, U2 typically end with old songs. I'll go from the War Tour.
Tour - closer - album closer is from
War Tour - 40 - War
The Unforgettable Fire Tour - 40 - War
The Joshua Tree Tour - 40 - War
Lovetown - 40 - War
[It is worth noting a couple of other closers rarely appeared on JT/Lovetown. With Or Without You was most prevalent, once on JT and ... eight times, I think, on Lovetown]
ZooTV - Love Is Blindness - Achtung Baby
ZooTV - Can't Help Falling In Love With You - non-U2
Popmart - One (20 times) - Achtung Baby
Popmart - Unchained Melody (20 times) - non-U2
Popmart - Wake Up Dead Man (20 times) - Pop
[Popmart also occasionally saw other closers, such as Mothers Of The Disappeared, Rain, MLK, and 40]
Elevation - Walk On - All That You Can't Leave Behind
As you can see, on only three tours (War, half of ZooTV, Elevation) has a new song closed the set. U2 traditionally use older songs, most specifically 40.
Edit: for further information on U2's usage of closers, check out the link in my signature.