As a 7D owner if I was to change anything it would be improved noise perf which largely seems to be a given in any version upgrade but more importantly improved AF. I've taken a lot of good images with my 7D, I had major issues at 200 and 400 ISO when I bought it and sent it back for repair. I'm not fully convinced it was fixed but it was better. The noise performance of the 7D when it was launched was considered to be very good and its what attracted me to it from Olympus however I have to say I was disappointed. At 100 ISO the Olympus E-3 was better, most of my shots tend to be at 100 so it was massive disappointment in that regard however once my 200 and 400 issues were sorted anything beyond 400 was fine and up to to 3200 was usable depending on that use.
My major grief though without a doubt was AF, as I say I've taken a lot of good shots but I'd have taken a lot more with a reliable AF. I've bought Focal Software to see if it improves it any, hopefully it will.
Mega pixels are not a concern, 18 is fine, I just hope that we dont get a 20 odd megapixle sensor without improved noise levels.
In terms of price I dont think this will be higher than the 6D, I think for what thats worth it will be circa £200 less. It might be silly but I just cant see Canon price a camera with a lower numerical code i.e. 7 v 6 at a higher price, it just doesnt sit right, if it was to be the case then the 6D should have been an 8D maybe. Sounds daft? Well maybe but its consistent I think with Canons current policy, the higher the No, the cheaper the camera i.e comparing latest models. One thing for sure Canon have a chance to put out a very good camera that could have a lot of Sports shooters after it.
I also think it will have built in wifi and gps like the 6D has.