My D810 was flagged as affected. Luckily, we have a Nikon Service Center here in Vancouver. I brought it in this afternoon and twenty minutes later, I got the camera back. I am not sure if the firmwares have been updated. It has versions C1.01 and L2.005. I do not know what they started out with.
I have never noticed any problems with my camera. I have taken long exposures but never noticed anything wrong but then, I was not looking for it either.