So far the AF comments have been like I would have expected. This is a place where Nikon can make a significant improvement for the previous generation but still hold back some performance for the higher priced cameras. Nikon has always made the AF performance just a little bit better at each higher price point in the same generation.
The high ISO is a bit harder to judge. A lot of the examples shown so far are not the best images for accurate evaluation. It will be nice to see some quality good side by side testing. It will also be interesting to see the DxOmark testing on this sensor.