I'm hoping to see both increased pixels and higher ISO, as follows:
29 Megaipixels+ would allow the same zoom factor for a given lens as the 7D, once cropped down to the same 18 Megapixel resolution and secondly, I am hoping for a 1 to 2 stop improvement in sensitivity, while keeping the same or lower level of noise.
An increase in sensitivity would be a huge improvement in both convenience and cost savings. For example a one stop improvement would be the difference between an f2.8 and a f4.0 lens. Meaning the f4.0 lens on the new camera would act similarly in low light as an f2.8 lens on the older camera. A f2.8 lens generally costs 2 to 3 times as much as an f4.0 lens and usually weighs about 2 to 3 times as much, as well. A two stop improvement, would let you shoot at f5.6 in situations, where f2.8 might currently be needed.
Of course, if you still want or own the f2.8, you could shoot in situations that you can only dream of, now. My 50mm f1.4 can practically take pictures in the dark. Imagine doing that with a 70-200mm f2.8.