So this is my working theory...
I know they were supposed to tour in 2016. I had it on good, solid ground that they had shows scheduled in Philly and a few other markets they missed the first time around, plus a few of the usual stops. That obviously changed when SOE changed. So that leg of shows was scrapped.
Fast forward to the fall of 2016. They have iHeart, they have Dreamfest... and they have nothing new to show for it. Rumors of work with DJs, secret video shoots, Bono blasting songs in Nice... even a track leaked by a popular DJ (light and energetic, as Adam referenced the songs were). All the markings of a promo tour ramping up, including scheduled shows... and nada. Not a thing.
So yea, I do believe that SOMETHING changed in that fall period... whether it was the political landscape as they said today, or they just couldn't wrap their minds around how to play the songs live? I don't know. Possibly a combination. Maybe they hesitated because they couldn't play it live, but then realized they needed a song or two to match the mood of the world after November.
But I think the album was supposed to be released last fall, iHeart and Dreamforce were part of the promo tour, and these stadium gigs were already scheduled as part of the SOE tour.
When whatever happened happened, they scrambled... and/or were told by LiveNation that hey, you guys already scrapped one set of dates on us, figure something out. That's when The Joshua Tree idea came about, and that's where we are now.
I do think SOE is near-finished, and I think we'll hear it in the fall. Edge hedged (ha!) on truly committing to a second half of the i/e tour, so who knows. He said it was likely, but left the door open for a different set up.
I'm a little surprised by no news of another album rerelease or a single. If this was truly a cash grab move, surely that would be part of it.
I get how some are upset at a "nostalgic" look from the band. I'm not that guy. I think it's silly to ignore your history when you're a band of the stature of U2. You can do both. You can be retrospective while also forward thinking. You can compartmentalize the two. A hat tip to the past on the way to the future. If anything I believe that's one of the things this band has been missing over the past 10 years. They're so desperate to remain hip and cool with the kids that they've lost their course and forgotten who they really are. I actually see this as a step in the right direction there... almost a dual acknowledgement and middle finger to the mockery they got in the SOI release debacle. Yea, we kinda overstepped... but, um, oh by the way, we're fucking U2, we're one of the biggest bands in history, and this one album sold more copies than any of your favorite artists will sell in their lifetimes combined. Don't you fucking forget it.