Richard, I will be watching for some reviews and user reports. I would love to have better iso but want to see how the new multi-Cam 4800 stacks up against the 3500. I shoot a lot of fast, small birds and sport. The 4800 might be fine for sport but do not know about the birds. I would also miss the AF-on button.
Also have to see what the new iso 100 looks like and the higher in fact not specs .
I am on no rush since I am happy with the cameras that I have but my D300 is going to need a big service at some point sooner than later so will watch the new D7K closely. Cheers, Tom