Not only that, but I've never used a pro body or full-frame body - I have a 7D and it's all I use (actually, I have 2 of them). The only input I can give in this discussion is speaking to my feelings about the 7D and what I'd like to see in the mk2.
I currently am shooting more wildlife and birds. The APS-C sensor is a huge boon. I use a 500 f4 IS II lens and 1.4x much of the time, and even that combo on a crop sensor is often not enough reach for many birds and smaller wildlife. People that have never actually tried shooting birds, have a hard time understanding how much magnification is really needed.
I have a 7D and a 5DIII and I agree with all of the above. I'd pay $4000 for 7D-II that was as good as the 5DIII. That means a better sensor and better AF and pretty much all of the other stuff that flyingSquirrel said.
That said, my 7D goes pretty much unused after I got the 5D, it's that much better and if I crop down to about the size I'd get from the 7D the images are good enough.
I too am hopeful that the 7DII will be an awesome wildlife camera. If not, then I'll join the small set of crazy people that want the 1.3 crop back as a compromise between extra reach and a high end sensor.
For the record, I'm not in the Canon bashing camp that some people seem to be. I'm 52 and the advances in camera tech in my lifetime are, to me, stunning. I feel like a kid in a candy store each time they push the boundaries.