I still think single SD or CF card could cause a bottleneck in the data pipepline. If you do the calculations you'll see that 24MP at 10fps is a higher data rate than the 1DX so I doubt it will actually be that much. It is more likely to be around 23.3MP (like 5D-III) and 9fps, which would still be an improvement on the 7D. Those numbers at least seem to be inline with the capability of the dual-digic5+ architecture as seen in the 1DX.
I've seen talk of improved video capability. I hope this means in-camera HDR-video. I'm sure Canon knows what the Magic lantern guys get up to in their spare time... Surely this could be on the cards right??? Staying on the topic of video, I would be shocked if it didn't have a headphone-out jack. I think the lack of headphone jack on the 70D is a deliberate omission to allow room for differentiation with the 7D-II...
Built-in Wifi and GPS makes sense for this type of sports/action/wildlife camera. It is essential that it has a "Rate" button like 5D-III. For working action photographers this is a kick-ass addition which really speeds up your workflow.
Eos: 1Ds-III, 5D-III, 6D, 60D | Canon EF: TSE-24L-II, 16-35L-II, 24L-II, 35L, 40STM, 100f/2.8, 135L | Wishlist: TSE-17L, 200f/2L
Tamron: 24-70VC, 70-200VC, 150-600VC | Samyang: 8mm-T3.8, 14mm-T3.1
Crazy Ideas: TSE-90L-II, 40f/1, 100f/1.4, 35-85f/2, 100-300f/4_1.4xInt, 500f/5.6_1.4xInt