Drug seems likely because it is one of his more popular hits and it's been...15 years or so since he's played it. The Loop is a possibility considering he soundchecked it on the Oye Esteban tour having played it a lot on the Kill Uncle and Your Arsenal tours. Let the Right One Slip In I think will never be performed again. I Know It's Over seems inevitable, so maybe next tour. That Joke and Sheila seem very possible, but as much as I love I Started Something, I'm pretty sure Morrissey doesn't like that song and that he won't play it. The same might go for Ask, though that seems more likely. Will Never Marry seems likely as well considering that it's popular, Morrissey seems to like it, and it's been very long since he played it. He has brought back its two sibling b-sides on later tours, so I think it's just a matter of time until that one returns.
Okay, just had to voice my opinions on the likelihood of those songs.
The one I want to hear most is probably I Started Something even though I unfortunately expect it never to be debuted. Well, here's hoping I turn out wrong.