You probably won't see Playboy Mansion, as they've never played it live (only a snippet in Streets) or probably If God Will Send His Angels, since they axed that one pretty quickly, too.
Discotheque is not very likely as it was axed pretty quickly in Elevation, but it might make a return appearence, who knows.
Mofo I don't think likely. That song was very ... unique to popmart, I think, and would be a surprise. Of course, Zoo Station was a surprise at the public rehearsals, too...
Please has the most possibility of the songs you've listed, I think. The acoustic version done on the Elevation 3rd leg fit very well and is thematically connected with a lot of the songs currently rumored for this tour, so...
If You Wear That Velvet Dress would be awesome. I've always wanted to hear a full version of the song, better still, one like the Jools Holland version, which is one of my top 10 all-time favorite U2 songs. Its chances of being resurrected live, however, are probably slim to none.
As for Last Night on Earth, it could be done, but I'd be surprised. It seemed to be pretty connected to the PopMart/shopping idea, so I would be surprised if it came back at all (but see Zoo Station comments above).
It's a shame, because these are great songs (well, I never liked Playboy Mansion much, but...) that, in the right context, could be awesome, I just don't see it happening anytime soon.
