Also, An additional 1-2 stop improvement in ISO performance would be welcome. I don't expect it to match the 5DIII or 6D, but a marginal boost in ISO is important. And, like the autofocus, the camera's weather sealing was very good when released, but it could be upgraded to match at least the 5DIII.
However, Zv is correct in that even four years after introduction, the 7D remains pretty much at the top of the APS-C world. Canon set a high bar with the 7D. Owners are very loyal and want the next upgrade to again set the standards for the industry.
Agree with this and you were bang on the money (as usual) with your earlier post, If I wanted to go full frame and keep the features of the 7D it has to be the 5D III, but it's so much more expensive- in the UK, the 7D can be got for under £1000, but the 5D III is around £2300. For me, that's an enormous difference and not one I can afford or justify at the present time, especially as I would also need to get a 24-105 or 24-70 2.8 II etc as a standard zoom.
Just as a side note, you said the 7D's weathersealing could be improved to match the 5D III, I thought they were on a par with eachother?