I don't get why internet experts think that the 7D mk II needs to be FF. It is preposterous, as FF and crop are two totally different tools, and crop is a better tool for nearly everything.
The 7D mk II will be a APS-C camera, the FF 7D 2, if you will is called the 1DX.
I agree that any 7D Mark II will be APS-C but to say that crop is better for nearly everything is wrong. It's not better for low-light and it's only good for reach and putting pixels on subject, when you are reach limited.
I hear a lot about how a FF/crop combo is the best for sports such as a 5D3/7D combo. While I agree it's convenient and useful, and ignoring price obviously, it would still be better to have a pair of 1Dx's with sufficient reach lenses. The 1Dx with the longer lens to make up for the 7D's crop factor will produce better IQ, at ALL ISO's. This is exactly why I ditched both of my 7D and 1D4 cameras in favor of a longer lens and another 1Dx. Again though, photography was helping fund a lot of that and had I been on my own, NO WAY I could have afforded that. So I agree with jrista and neuro regarding the cost factor regarding crop cameras. It really was the price difference between a 7D and 1D4 back in 2010 (even though technically the 1D4 is a "crop" camera).
With that being said, I really hope the 7D replacement is revolutionary and I think it will sell well and make a lot of people happy. I may consider it as a "3rd" camera if the specs are right and I have the funding.
IMO this is exactly what Canon wants people to do. And it has succeeded. With out a good crop sensor camera the upgrade path is pretty well guaranteed with people that can afford it.
Same with Nikon.
The Nikon 810 FF is getting there. That camera just about does away with the crop sensor argument. I think the next 810 replacement will be the nail in the coffin for crop sensor cameras for Nikon users.
My problem is I have Canon gear. And I don't have a really good crop camera (except the aging IV). And I will not upgrade to the 600mm prime. Weight is my enemy. So what do I do? It is a real problem for me. The only thing holding me in the Canon camp now is the excellent 500mm glass.. Amazing build quality and sharpness.
If Nikon updates the 500mm lens. And Canon does not have a good answer to my particular problem and I expect thousands of others? I have a feeling many people will start to switch? I am just hoping Canon does not let this happen.
For birding 500mm is as big as I can go at my age.
I still have the mark IV and it is a great camera. But in a couple of years I will be ready for a new body. And I will look around at my options then and decide my best path.