I have really enjoyed this thread and like many, I am torn slightly. My one and only wish in regards to the D7200 has been that it had group focusing. For street photography, I use that 99% of the time. I had often wished Nikon would have put it in the D7200 with a firmware upgrade, but it never came. So when it came in the D7500, I said to myself. I will be purchasing one as soon as it becomes available. The lighter weight is also a plus. The focus mechanism is the most important thing to me in a camera. This is why I use Nikon. So here is I what decided to do after much reading and pondering. It does bother me that there will be no grip for it as I find the grip to be very useful as I have rather large hands and the balance is better with it.
First off, let me start with this.
I do have all three D7XXX bodies as well as a D5, D500, D750 and D800E
If you look through my Flicker or blog space, it becomes obvious which cameras are my favorite as I leave all the EXIF data.
When shooting full frame, I will reach for my D750 90% of the time. The weight and size is perfect for me. The focus is blazing fast and the low light high ISO performance is killer great. (Though not in a league with the D5 or D500, nothing is).
When shooting with a crop body, I do reach for my D7200 about 60-70% of the time. Auto focus speed is about the same as the D750 and ISO performance is great. About a full stop less than the D750. In fact, the only time I really use the D500 is when I will be going late into the night and need the low light performance of this beast.
But I will say this. The sensor in the D7200 in my opinion is better than the sensor in the D500. The colors are more vibrant, ISO I could swear is also better. (I am a jpeg shooter) The lighter weight is great. So in my view, the only thing I would be gaining in the D7500 would be a little quicker auto focus and group focusing. I would be loosing my grip and jpegs from the sensor. So I decided to pass on it. If I needed the body or my D7200 dies, Then I would rather buy me another D750. I can buy another gray market D750 for a couple of hundred dollars more and have a much better camera.
So I will be passing on the D7500. I will wait for the D750 upgrade if it ever comes, but truth be told. How do you even improve really on what is out there.