Apparently the FIA renders and the regulatory volumes seen so far are based on draft 7 of the regulations. They have proceeded to refine and are now on draft 10.“We developed rules that adapted to the new engines. If you're limited in terms of energy for the straights, you don't want extra weight or drag that can slow you down. We started from here in the development of smaller and more agile cars and with the implementation of active aerodynamics” explained FIA Single Seater Director, Jan Monchaux.
Most notable difference between 7 and 10 is that the baby venturi inlets seen in 7 are gone. Floors will be flat unless things swing back
Also spotted this on the FIA website
Maybe early signs of more automatic detection of incidents so yellow flags can be deployed quicker. Also, GPS sensitivity will be useful for properly detecting false starts- The GPS antenna is being repositioned to improve sensitivity and to allow for future developments in active safety.