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very presumptuous of me to try to add to this, but I'll try- digital cameras don't have one ISO like an ISO 400 film does. They have a wide range of ratings and you can freely select the one you like by setting the transfer curve. You might choose for example 100, 200, 400... maybe even 800 or higher depending on your tolerance for noise, and/or if you are shooting for lower resolution finish. Seems like selection of ISO can actually happen after shooting, in REDcine. You can select fast and more noisy, or slow and less noisy.
 
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I expect it is kind of a given to be able to turn up the gain in camera. It sounds like we'll be able to do it in post as well... though I expect camera-side will look better [though that is just a guess...]

Lots of guessing here.
 
Well, at least initial gain setting would have to be in-camera; I was thinking of the transfer or contrast curve that maps the raw sensor output to the RGB values you see on your display. You have to use some curve, since raw linear sensor output is pretty much unviewable. The choice of curve sets what effective ISO rating you get, as well as the amount of contrast, and to be precise it's not one curve but a family of transfer functions that also controls the color response. I think the Viper camera does this sort of thing in post to some extent also.
 
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