According to the Italian edition of Motorsport.com, Mercedes is expected to be inspired by the design of Ferrari's side air vents, first introduced by the Scuderia on the SF car
-H, designed for the season 2017 by Simone Resta and Enrico Cardile.
According to Motorsport.com, Mercedes engineers are expected to lower the lateral safety components on the sides of the car slightly, allowing Mercedes to design the wide air intakes used by Ferrari for several years. The air flow will then be directed above the safety element, which in turn will become an aerodynamic part.
With Mercedes changing the side structures, you want to solve the problems that you had with cooling the drive unit last season. The third specification of the Mercedes unit is often to overheat, and higher air flow will increase the capacity of the unit at the same time.
Mercedes should also organize elements on the back of the car to design the Mercedes W 11. it would be a bit slimmer than the one on the Mercedes W 10.