They're not actually working together.... Ryan Tedder said so himself that the album is very "Adele-ish", but different. I don't think Mike WiLL Made It is capable of making any Adele song be different but still sound like Adele's type of song. I think he was just being hopeful, like every other artist out there nowadays. Literally everyone in the music business wants to work with her. Plus, after the William Orbit thing, we can't believe anything anyone says unless Adele or someone from her team confirms it themselves.
"BITCH, I got 10 Grammys
BITCH, I'm wearing granny panties
BITCH, my album outsold yours
BITCH, don't even need to tour
BITCH, I set fire to these hoes
BITCH, I'm selling out these shows"