Nano smano, I think that's just a gimmick to sell more lenses. Some of the best IQ I've seen from Nikon lenses has been without the N. Not a selling point IMO, either the lens is good or it's not and I suspect the 70-200 f/4 will be very good.
I hafta disagree, strongly. Nano coat really does do something...I know KR thinks it's marketing and maybe I've fallen for it but hey ;-0. I agree that lenses can be great without it though, of course. 
Now, perhaps there is something "else" that is the cause--perhaps lenses with Nano also get better regular coatings as well. I do not know. However, the lenses I've used with Nano have a certain "pop" to them... For example the 50mm 1.8G is a good lens, but the 24-70mm 2.8 despite having a ton of elements has way more of a pop to the images. You'll see it if you compare the 16-35mm vs the 17-35mm outdoors with saturated colors in the frame I promise! ;-0
And gqtuazon: Nano coat doesn't necessarily have anything to do with the golden ring, but a lot (maybe all? not sure) of the newer gold ring lenses have it.
I bet that the 70-200 f4 VR will have nano and a gold ring. Even the 24-120mm f4 has it.





