The D6 probably will not sell well. I don't see anything that screams, I am gonna sell my D4 or 5 and get this.
Do you have a D4 or D5?
I suppose my best analogy given my professional field would be in network test tools. I have a tool that tests copper pinouts and network link up to 100BaseTX, CDP neighbor identification (ie what's at the other end of the cable), protocol testing, and can do up to Class III PoE testing. I buy a tool that can still do copper pinouts, but the network link is now up to 1000BaseT, still does CDP but adds LLDP too, still does protocol testing, and can do Class IV PoE testing. As a professional I make that purchase because while the changes are evolutionary, I can benefit from those changes, and because as a professional I can write-off the cost of the purchase of the tool as a business expense, depreciate that cost over time.
Professional photographers might well find themselves in the same position. The older model works fine, but the newer model has incremental improvements in existing features (the camera-side) and some fairly substantial improvements in the back-end for basic connectivity to get the images out of the camera. Depending on what services Nikon is offering, it wouldn't surprise me if they have or will introduce a service that allows a Wi-Fi connected camera to connect to Nikon's servers to mirror the data, caching it for later retrieval or for retrieval by say, an editor working in a remote office. This allows the photographer to concentrate on the pictures, while the editor can make editorial decisions as to which photos to use/purchase, especially when covering live events where the value of the information drops the longer it takes to come to publication.
The familiarity in the design is actually the strong suit. The photographer picks it up and it works like their old one but
better, the only things to relearn are all improvements. Same with Canon's new offering. It's familiar, it's just a bit
better than the old one was.
