I wouldn't be surprised to see a back 3 being used at home against the "weaker" sides. It would avoid the need for the inverted full backs to pack the midfield and Fernandinho needing to drop into a deeper position.
--------------------------Bravo----------------------------
--------Stones-------Kompany-------Otamendi-------
-----------Fernandinho--------Gundogan--------------
Sterling/Sane--------KDB-------Silva----------Nolito
--------------------Aguero/Iheanacho-------------------
Its impossible to know how this would play out but on paper it looks frightening to me.