@ChrisWillman: Country fans are really going to be surprised by a major act making an unexpected pop move tomorrow. (And no, it’s not the Band Perry.)
He's already said it's not Sam Hunt or Little Big Town. Probably not Kelsea Ballerini, Brandy Clark, or Kacey Musgraves (none are "major").
I don't think it'd be anyone that just released an album, ruling out Keith Urban and Blake Shelton.
Idk who would be unexpected, though. I guess Miranda would be a bit surprising, or maybe Reba, Alison, or the Dixie Chicks. Dolly, Shania, Carrie would not be surprising.
It's also a bit unclear if "pop move" means "transitioning to pop" or "collaborating with a pop artist."