As we know the pace at which Formula One moves and develops is phenomenal and even though Mercedes lead the way, they're still introducing parts to improve performance and keep the gap to their opponents.
The changes to the nose tie into the team increasing their turning vanes from 3 part appendages to 4, with more mass flow for them to deal with.
A small change to the teams brake duct is also a worthwhile subject to touch on too with a small vertical blade added above the brake scoop. This blade will create a vortex similar to the one already being generated by the upper surface of the brake scoop, working together these vortices help to control some of the wake induced by the rotating tyre outbound of it, reducing the impact it has on the additional mass flow being generated under the nose.
An upshot in performance won't all come directly from these changes with gains being seen further downstream too as the area provides a critical transition, with airflow migrating toward the splitter, bargeboards and around the sidepods undercut. The quality of this airflow will further enhance the performance of larger aerodynamic surfaces such as the sidepods, floor and diffuser.