I'd argue with you about the amount of data to process being too much....
I posted this in another 7D mk II thread but wanted to mention it here as well. I have decided that I would be willing to bet money (if I had any money) that this camera will have 30+ MP, and that, in Q1 of 2015, a camera will be released from Canon which will have 40-50 MP. Call me crazy.
It might go 23-24mp, anything higher in a APS-C would cause big technical issues trying to achieve a 10 fps speed. The amount of data to process is too much.
Since it will have likely have dual pixel technology, you could claim that its 50mp, but the dual pixel output is combined before saving to a memory card. There is a possibility that those dual pixels will do more than autofocus, like improving DR, but the specs will be in the low 20 mp range.
Look at the 60D... it has a DIGIC4 and saves to SD cards. We now have DIGIC6 which has 20 times the processing power.... When the 60D came out with it's SDHC cards the maximum transfer speed was 25Mbytes per second and now we have SDXC-UHS2 cards which support up to 2Tbytes of storage and up to 312Mbytes per second storage.. this improvement in technology is easily enough to double the frame rate plus double the pixel count of a 60D so handling a 36Mpixel sensor at 10 frames per second is not a hard task.
My comment had to do with the internal readout of the sensor and the processor. That's why the 7D and 1D series use dual processors, to get the data flow that's needed. A 50MP raw image before it is compressed by the processor will be well over 200MB. Jpeg images are very highly compressed, but the processor must work very hard to compress a 200MB+ image to jpeg size. After that, write speeds are not the issue.
SDXC UHS cards are still limited to slow write speeds after their first use and a normal in camera format like most users do. Some are misled by reading specifications, they are for new cards only, or for those that have undergone the slow process of erasing. Just doing a regular format in camera does not erase a card, so a SD card must erase a whole block of used sectors before they can be written to. That's why they say "up to" in the spec.
Hopefully, a 7D MK II would have dual CF slots, which will not be a write speed limitation.
I think that if they wanted to, that they could read out a large pixel count sensor more than 10 times per second.... and yes, dual DIGICs really helps a lot. After all, I have a 60Ghz spectrum analyzer sitting on the bench next to my desk.... you can design some insanely fast electronics if you really want to.
Although most of us think in terms of bytes, I/O knows no such bounds. Reading a sensor is a massively parallel operation and instead of reading one byte or word at a time, they can be designed to be read hundreds of bits at a time, and even rows at a time into an internal buffer on the sensor. ultimately it comes down to design decisions and architecture.
However we slice it, even with dual cFast cards, the real bottleneck is going to be dumping it to storage. A good buffer can help a lot there, but ultimately, the buffer fills and things slow down.