Interesting reading. So the main way they'll be addressing the problem is some sort of speed limit under yellow flags, which certainly seems sensible.

I'm not sure I fully agree with this conclusion:
11. It is not feasible to mitigate the injuries Bianchi suffered by either enclosing the driver’s cockpit, or fitting skirts to the crane. Neither approach is practical due to the very large forces involved in the accident between a 700kg car striking a 6500kg crane at a speed of 126kph. There is simply insufficient impact structure on a F1 car to absorb the energy of such an impact without either destroying the driver’s survival cell, or generating non-survivable decelerations.
The implication of this seems to be that the outcome would have been no different in Bianchi's accident if he'd hit bare armco instead of the crane, because of the speed involved. But not all accidents happen at that speed. There must be a wide range of speeds and impact angles where the car's crumple zones can do some good, if there is something at the right height for them to hit.
I wonder how much this conclusion was influenced by the difficulty and cost of modifying (and then inspecting and certifying) all the recovery vehicles at every circuit.

Good to see they're finally going to stop Bernie meddling with start times to suit his TV customers:
It is proposed that a regulation or guideline be established such that the Start time of an event shall not be less than 4 hours before either sunset or dusk, except in the case of night races.

It is also recommended that the F1 Calendar is reviewed in order to avoid, where possible, races taking place during local rainy seasons.