Think Foden will take De Bruyne spot in the full time number 10 and Bruno will replace Gundogan in the CM that pushes forward into a second number 10 position. I think they bought Nunes for the role last year for 50 mill but he's been poor so have used Kovacic instead. Bruno will be a big upgrade.
Foden and De Bruyne played centrally together a few times but when De Bruyne played Foden mostly moved to one of the wings.