They really need:
4k that is real 4k and not like 1080P
forget all the stupid DNR where they turn even ISO 100 to wax unless it's extreme contrast edges, we want natural 'grain' and detail and we don't want fine surface detail to be turned to mush from plasticky fake looking DNR!
we need 10bits not bits recorded internally, 10bits 4:4:4, compressed, detailed, 4k recorded internally would be great (4:2:2 at worst). (and it should allow 1080p RAW like ML)
and how about just building the zebras and focus 100% box and focus peaking in? basic stuff!
What he said.
Although I'm not really fussed about RAW if they can improve the overall dynamic range.
Listening to people bitch about Canon not cannibalising their Cinema EOS line is all fine and dandy when it comes to the C100/300/500 but in my views the 1DC is fair game.
Its basically a 1DX with a fancy firmware and (supposably a better heat sink, but not proven).
Kill that puppy off from the Cinema line up and put the features that you learned from there into the 1DX2 and 5D4.