I'm not so concerned about the 2.3x FOVCF as I am about the battery...sure the crop does mean poorer low light and less DoF, but the smaller sensor means you can use fast primes for low light and still have fairly wide DoF which is useful in its own way. For reach purposes this is an obvious win, the 5D3 can be used when you want wide shots, shallow DoF, low light, and aren't too concerned about the crippled resolution.
They are working on battery grips which will be mandatory in practice. Hopefully something that takes e.g. two FP-970's and runs for four or five hours on those.
I'm estimating that if nothing else this disruptive shows up by July they will sell at least 10,000 of these which will spawn a whole industry of add-ons for whatever weaknesses the unit has. What will also happen, unmistakably, is Canon will have to yield on price and/or crippleware. Which I think they were planning to do anyway once they had their ransoms from all the rental houses. Since this camera is EF mount, Canon wins anyway to a degree, but the now common reverse engineering of their format may end up taking that away too. They are working on IS and AF support for EF.
I'm sure this is the initial salvo and a year from now at the latest BMD will have a large sensor version (perhaps with 4K and AF) for $5000 or whatever. BMD's entire design and concept is so very Apple. It's smart, it's sharp (milled aluminum, minimal UI focused on touchscreen) and it's not crippled...yet it has an internal unchangeable battery (just like Apple's things). If Apple went into cine cameras this would be their product. And Apple showed how to slaughter entrenched powers across the board. BMD, if they can execute to the degree they are showing, will be a formidable challenge to slumbering giants.
I am keeping my Canon 10-22 and Samyang 8mm for this thing or anything that might challenge it by then. And I will just again warn Canon to decripple the 5D3 immediately and save any shot at relevance in the mass market. Disruption happens and it's a cold mean bitch.