as current 7D user I will only upgrade to 7D II, if sensor performance is SIGNIFICANTLY improved. Especially low ISO [banding] and DR across the range. I do not need or want more MP, 18 is plenty fine. APS-C is also perfectly fine with me [APS-H will definitely not happen!] and I do not need or want more fps [even 5-6 fps are sufficient for my use]. Video crap? Could not care less. :-)
In terms of features, I would want a fully working Auto-ISO model [better than 5D 3, at least as good as Nikon D800/D4], fully articulated LCD plus a multifunctional radio-module in the hump: radio-masterflash-controller (RT-system) plus GPS plus WiFi. In that case I would happily forego the pop-up flash. That would also allow for even better weather-sealing. :-)
And a price tag of less than USD/Euro 2000 for the package.
If I had really free choice, I would just love to get these specs in a compact mirrorless Canon - without any compromises in image quality, performance and useability. Provided the EVF is really top-notch. For such a mirrorless 7D II with EF-/EF-S adapter INCLUDED in the package (!) I would be willing to pay up to USD/Euro 3000. :-)