Looks like Phil Collins will show up but not perform. I'm 100% expecting three or four songs as a tribute to Phil from some current pop stars.
Sade is almost 100% a no-show. I could easily see Alicia Keys induct them, maybe with a multiple-song tribute, or just a five-minute pre-recorded tape.
The Hall ceremony is maybe too small for Kendrick Lamar. I could see SZA appearing to induct Luther Vandross, and then doing a 2–3 song tribute.
Wu-Tang and Billy Idol will perform. I think Billy Idol will be almost certain to make the opening.
Iron Maiden will be a no-show, and it's possible some former/current non-band members will attend the ceremony, but I'm not sure whether they will get on stage to give a speech. Tom Morello/Dave Grohl will prevent them from being totally Chubby Checkered, so there will at least be someone to induct them, followed by a five-minute pre-recorded tape. No song performance.
It will be only Peter Hook for New Order. He even semi-confirmed it: "It is a disgrace when fans vote you in and you don't even show up" so he probably already knows.
Queen Latifah and MC Lyte will get the performance treatment and perform.
Everyone who says Oasis won't show doesn't really know the brothers. They actually love every spotlight and are actively engaged in industry activities to use the platform to say something. They will show up and perform, and they will be the headliners of this class.
I want to switch my nomination for Joan Armatrading to of Montreal. I'd like to see how they do this round since they're not really discussed that much.
I could imagine the Hall starting the ceremony with a Dolly Parton tribute like how the Sly Stone tribute opened last year's ceremony considering how beloved she was. Only issue is that Dolly's induction was relatively recent so maybe they don't want to repeat it too soon and just play some of her ceremony footage in the in memoriam to then possibly lead into a tribute performance. I also think the Hall could bring on a current country star like Ella Langley to pay tribute to Dolly considering her Choosin' Texas song has been big all year and in a way clearly owes a lot to Dolly paving the road for female country artists.