I really like what they've done with this car, they took a very interesting approach to helping airflow to the floor. The huge undercut throughout the chassis, the transmission, the front suspension being nice and high. The cape and nose being slim helps feed much more airflow to the bargeboards, but also the floor.
Perhaps the weakness of the MCL34 was that they couldn't feed enough air to both the diffuser and bargeboards. That although the design was good, the front suspension and nose was interfering with the air mass that could travel through the bargeboards and along the floor. The consequence was either stalling the airflow traveling along the car, or the airflow going directly under the floor. With more airflow, there should be less stalling more front end downforce from the bargeboards, and more airflow going to the diffuser as well.
This along with the revised rear end, possible only by the new extreme transmission McLaren have designed for this year. They have essentially created an undercut across the entire bodywork to help guide air over the diffuser, and the high transmission let's that tunnel start nice and early. It's obvious the Renault engine has higher cooling requirements than both Ferrari, Mercedes and Honda.
I really hope Renault isn't playing games with their car reveal. It could be their cooling requirements are different that what they specified for McLaren. Which would put them at a significant disadvantage, if McLaren still manages to beat them then what?
The height of cultivation is really nothing special. It is merely simplicity; the ability to express the utmost with the minimum. Mr.Lee