Okay, this just seems too good to be true. Manufacturers MTF charts are hardly an objective review of a lens, and we'll have to see once this lens gets into people's hands. I remain skeptical that this new lens is going to be sharp at the long end, and at this point I have no plans to put any of my current gear up for sale. That said, I will be VERY interested in hands on reviews when real live people put this lens to use.
I have been reading comments on other forums in other languages.
1) Why cheap: It misses the number of expensive glass elements which are in the 80-400 and 200-400. 200-500 = 3ED elements, no Nano coating. 80-400: 1super ED, 4ED +Nano, 200-400:5ED + Nano
2) MTF analysis: it promises an exceptional sharpness in the middle at 500mm. Compared to the 200-400 it loses that sharpness fast from the center. The main weakness will be the bokeh, which probably will be close to the Tamron and Sigma but not the more expensive Nikons
3) Indeed tests will have to show what this delivers in practice, but many agree that a lot of people that buy exclusively Nikkor and are on a more limited budget will certainly go for this if they are looking for long telephoto capability.