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.
If you have a 95mbps SD card and the slot/chipset supports full speed 95mbps then single SD slot should be no problem. If an older tech slot/controller on the camera is used then it may be.
i.e. one of these:
I just down loaded some CF cards and I sustained 102MB/sec bytes not bits. That's just more than 8 times your 95mbps SD cards.... Can we just stick to the better cards please.
SD where meant to be smaller and cheaper than CF