The 7D does rock, except for the IQ at high ISO, so I ended up getting rid of mine 
I would like to think a 7DmkII would address this issue, but if it had a 1DX type sensor and much better IQ it'd probably eat into 1DX sales, so perhaps not a huge increase. Hope I am wrong though...
I doubt a 7D II with a better sensor would eat into 1D X sales...the two cameras are several degrees removed from each other. Now, if they stuck a much better AF system or higher FPS in the 7D, that might eat a little into 1D X sales...everyone really seems to want top-notch AF on every body they have. The thing about Canon that I see is if they keep releasing cameras that do NOT have competitive improvements in ISO, they are going to really start falling behind their competitors. Sony has made some huge strides recently in readout noise levels...Canon's starts as high as 25 e- or more and bottom out at about 3-4 e-, where as most of the new sony sensors are consistent at about 3.0 e- for any ISO level. Its obviously possible to greatly improve read noise levels, and I can't see Canon not competing on that front in all their cameras.
I use the 7D at ISO 6400 all the time, usually with a f1.4 lens. And plenty of those pictures are great! However, concerning the sensor, I cannot fathom why people expect a 7D mk II with a 1DX sensor. Moreover, why they would expect that camera to be anywhere near 7D pricing...
You may just be getting more light down the lens, which would improve exposure. My problem is that I have low available light to start with, as most of the wildlife worth shooting, including raptors, tend to forage and hunt right around sunset. As such, I have to use really high ISO settings with limited light, which is pretty rough on the noise front...I can't get more light down the lens to offset the noise, so I'm stuck with pretty noisy pictures with limited detail in fur and feathers. My complaint isn't so much about the 7D, its that I bought the 7D expecting it to be a while before a replacement with better ISO came along. I really want better noise levels at ISO 3200/6400...usable ISO with low enough noise that in low available light, it does not eat away detail. I am just curious to know how long it might realistically be before Canon releases a 7D II that might solve that problem...did make a good decision getting the 7D now, or are my wishes of better high ISO noise performance going to be met a lot sooner than I expected?
If it is taking good pictures today, why won't it be taking good pictures next year or the year after, etc. etc.? I had my F-1 for about 35 years. Today we are programmed to think that we have to have the newest models. I'm as bad as anyone about that, but the honest truth is any digital SLR today is going to be just fine until it dies. A new model with new bells and whistles isn't going to suddenly mean your old one stops working. It might make you want the new model (it probably will make me want it) but that's what marketing is all about.
Its a great camera, however for my usage of it, the vast majority of my photos are not quite up to my expectations. Again, not really a complaint about the 7D...just a complaint about Canon's noise levels in general, and if Canon propagates their new low-noise sensor design from the 1D X throughout their line of cameras... See the above explanation of available light and times of day I shoot for more detail. Canon can market anything they want...the only thing I care about and actually need is lower noise at ISO 3200 and above...and USABLE ISO 3200 in limited available light. I absolutely love all the rest of the 7D features, and am not really sure how much more they could be improved. I also have no complaints about low ISO noise...seems to tweak a lot of people the wrong way, but low ISO noise, while it may be a smidge worse than my 450D at ISO 100-400, its also only visible when pixel-peeping, and its also 47% more pixel dense than the 450D, so that slightly higher noise just gets absorbed in any real-world viewing scenario anyway.
If the 5DIII is announced in the next several months, I think you'll see a 7D II sometime around the Photokina show in September. I don't think Canon would want to go to that show without a new camera to brag about. But that's just my opinion.
Good point...I wouldn't expect them to hit Photokina without anything fancy to show either.