I'd agree with several of these posts. I'll be very interested to see price point and uptake. It would seem that Canon have missed the point slightly, in that the enthusiasm for DSLR film making is from people who value a camera that can do both, and don't have the money to split their interests across two product lines.
If this is a high end product, aimed at Hollywood, then fine. I have a feeling though, that this might be one of those Canon eccentricities that never really finds it's desired market.
It is a higher end product than than their DSLRs.
Canon sees these cameras as being something to compete with the cheaper(?) Arri cameras.
The C300 cameras are not and were not targeted at people who take photographs. Yes, maybe they can, but nothing about their specifications or look says that to me. The C300s have neither automatic focus nor automatic exposure.
For those that are using the 5D2 or 7D to shoot video, I think the concept cinema DSLR is the one to watch for.
Now where will that get priced? Interesting question.
I can easily see it being more than a 5D2. More than the 1DX? Hard to say without knowing the full feature set. It could easily be $4k-$5k or more if it brings with it an increase in performance that results in requiring less post processing (time is money.)