Christine wants to rejoin the band according to The Guardian

[WildHearted]

Originally Posted by Johnny Stew

Oh, you're definitely right about that. My comment about Chris & Stevie adding backing vocals was more secondary to the thought of Christine adding keyboards. Unless my ears are deceiving me, "Miss Fantasy" and "Sad Angel" don't have any keyboards. Yet they feel fully realized, instrumentally. So if the remaining five tracks sound similar, then some part of their current instrumentation would probably have to be stripped away for Christine to contribute.

Miss Fantasy has a rather prominent (but not that great) piano part during the bridge and the outro.