Ever since the 1D-X was announced, I've given up trying to predict what Canon will do.
Still, it is entertaining to speculate. I think Canon has too many cameras with the same sensor and needs to find a way to differentiate the lines. I question if they would put a 24mp sensor in a Rebel and then recycle the exact same sensor for a 7DII. It's one thing to let technology filter "down" from one model to another, but much harder to successfully pull off having technology filter "up" to more expensive models. Especially so, if there is a nine month gap or so between the announcement of a T4i and a 7DII. (Perception among 7DII buyers that they are being fed "old" technology.)
My wishful thinking: a more modest increase (21 mp) or no increase (keep at 18 mp) for the 7DII with improvements in noise, dynamic range and ISO. This allows clear differentiation between the 7D and the Rebel line.
I keep asking myself, what would cause me to upgrade from a 7D to a 7DII? I'm not an anti-megapixel person, but that alone won't do it for me and I suspect it won't do it for most 7D owners.
Some argue that current 7D owners aren't the target market (Canon wants to lure Rebel and 60D owners). To some extent that may be true, but two thoughts there: First, sophisticated Rebel and 60D owners also need to be convinced that the 7D is superior enough to warrant the upgrade and Second, the DSLR market is much more mature today than just a few years ago, meaning that manufacturers need to rely on repeat sales much more heavily than they did when the market was expanding by leaps and bounds.
Finally, the death of the APS-H sensor has to be a factor. The recent Canon interview showed that they hope to fill the void with teleconverters and new lenses, but they will be watching the market to test the reaction. As some readers have pointed out, the 1.6 crop factor of the APS-C sensor makes a better teleconverter than any true teleconverter. (No loss of image quality and no loss of speed).
I have my wish list, but mostly I plan to just sit back and enjoy the ride as I watch what Canon rolls out over the next year or so.