OK, this is definitely going too far with music geek-osity, but just to satisfy my curiosity I checked the tempo (BPM) and key of the songs from the 5/28 show vs. the recorded versions. I did it as quickly as possible, so this may not be 1000% accurate, but it's close. I didn't check Murder by Numbers or Walking in Your Footsteps, because I didn't have the originals at hand. The comment refers to the new version, compared to the old, and only to tempo and key changes:
Message - no change
Synch II - no change
Spirits - changed key
World Running Down - much faster
Don't Stand - changed key
Driven - no change
Walking/Moon - changed key
Truth Hits - changed key, slower
Magic - changed key
Wrapped - changed key, slower
Bed's Too Big - no change
De Do Do Do - no change (except at the end)
Invisible - changed key, slower
Can't Stand - faster
Roxanne - faster
King of Pain - no change
So Lonely - changed key, faster
EBYT - no change
Next to You - slower
A lot of them were much closer to the original tempos than I thought, so much so that you'd think maybe they're playing to a click to sync up the BG vox...
They also changed the key on more than I thought...I guess because Sting thinks he needs to sing in a lower range. My observation is that he can still do most of what he used to, but maybe he doesn't think so. There is no other reason to change the key of a song.
Not surprisingly, the ones that seem the best to me are the ones where they didn't change the key, and either kept the tempo the same or played it faster. I think on "Wrapped" they probably slowed it down to facilitate Stew's percussion section, which is cool.
For the heck of it, I also checked the tempo of a random live recording of "Next to You" from 1979. It topped out at about 260 BPM.