Just ordered the 3S with the FMC kit.
So I know it comes with the ND Filters.
I never used an ND filter for my Mavic 2 Pro, since it has variable aperture and most of the time I used it wide open or 1/2 to 1 stop down. I recall someone testing...
I just ordered from Adorama, which showed the FMC with the RC-N3 controller in stock for $1499. In fact they showed the RC3 FMC and the aircraft with just the RC-N3 available as well, for $100 more than they were a couple of months ago.
B&H...