I would usually be in the Streets opening camp, but I think I agree with Larry. If you start with your best live song, where do you go from there? Everyone will be expecting it as well, it's a bit too predictable and I think it's good to keep people waiting and expecting it, so I think it should end the main set.
From their last concert at Anaheim and based on Adam's comments regarding Achtung Baby, I think the setlist will be something like:
1 - Even Better Than The Real Thing
2 - The Fly
3 - Mysterious Ways
4 - Until The End of the World
5 - One
6 - I Will Follow
7 - Beautiful Day
8 - Glastonbury
9 - I Still Haven't Found What I'm Looking For
10 - Elevation
11 - New Year's Day
12 - Magnificent
13 - When Love Comes to Town with BB King?/Angel of Harlem/Desire
14 - City of Blinding Lights
15 - Vertigo
16 - Discotheque/Out of Control/Bullet The Blue Sky
17 - Sunday Bloody Sunday
18 - Pride (In The Name of Love)
19 - All I Want Is You-Running To Stand Still (best segue in Streets ever)
20 - Where The Streets Have No Name
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21 - Hold Me, Thrill Me, Kiss Me, Kill Me
22 - With or Without You
23 - Bad/40
I think it will be a strongly influenced AB beginning. Beautiful Day won't be that late into the set, so song 7 seems as reasonable place. If BB King is willing to hang around, he could be a surprise guest and could that could lead to a few Rattle and Hum tunes, either full band or acoustic.
COBL, Vertigo and Discotheque might lead to a lull in the crowd, as it's not classic era U2, but then being Glasto, they might like the more current stuff, who knows.
U2 have enjoyed playing the trio Bullet, Sunday Bloody Sunday and Pride together before in some kind of rebellious part of the set, so that could happen. I mentioned Out of Control as a possibility, as they could bring in another early energetic tune, maybe Electric Co. is another one, even if either are not universally known.
The great segue between Running To Stand Still and Streets would be incredible, still my favourite transition between any two songs and done to perfection on Zoo TV. I also think a gradual transition from All I Want Is You would be great as well, I can definitely see that song being played at some point.
I went with HMTMKMKM as a kick ass start to the encore, they have to come out with something quite powerful and exciting. An alternative could be Zoo Station or Mofo, that would be incredible. With Or Without You is a given and Bad/40 would be a great way to finish. If Bad doesn't finish the set, it will definitely be included somewhere.
I really have a feeling that Streets will not be the opening song, as the band will be fearful of peaking too early. A gradual build up is more powerful and EBTTRT has been a great opener. Also, having Streets later on means they can segue into it and I think that's really powerful, rather than just playing it straight up.