I have been waiting for this lens with great anticipation.
LenScore test results for the new Nikkor 300mm F4 VR are now out. Unfortunately the results are disappointing. See http://www.lenscore.org/
The new lens, with its Fresnel component, does not even come close to the performance of the older Nikkor 300mm F4 lens without VR and without the fresnel lens.
The advantage of the new lens is a reduction in size and weight, while unfortunately also reducing resolution and overall image quality by approximately 20%.
Too bad, there is still a hole in the market for light weight, high quality BIF photography.