Re the Eno choral intro, I'm sure u2songs reckoned it was a new version of "Deep Blue Day" from the Apollo album, albeit one that's very, very different... but I don't hear that at all to be honest. The chord progression and vocal harmonies sounds very U2 to me.
Given it's been 7 years without an album, what difference does another year or two make. They've had lots of opportunity to just release stuff low-key for RSD etc in the past and not done. Similarly, anything other than a new album and tour isn't going to have an impact culturally, so who knows what they'll do.
They never want to waste anything either, so releasing Glorify in some form (a remix, or maybe it is something more ambient-y so no Larry = no problem) might just be as part of a promo push for her album?
I know its always been "one for all and all for one", but after the success of the Sphere shows, I get the impression they much be itching to get going with a new album and tour.. and how long do they give Larry to get fixed? Is there a risk he won't be able to get back to full fitness for the sort of schedules they will want to do, even as they get older.