From day 1 of the 1DC crop or not crop and MJPEG choice is a processing power/ speed/heat problem more than anything I guess, the processor on the the 1DX/1DC were specialised to process jpeg that is why it uses record in Mjpeg to reduce R&D cost and processing power. Similarly using a cropped recording output, the data need much less reprocessing like the sony( less overheat less battery usage)
If I guess from what I see on the 1DX2, I will say Dual CFcard, 4K RAW internal/external, 5K/6K internal MJPEG, C-log will be something they can easily put in with minimal R&D and minor Hardware improvement.