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That depends on how the readout process works for the dual pixel image (whether the ISO can be reconfigured for each sub-image); I don't know much about it at this stage, except that on previous models, ISO is applied at the very end, during readout. There is a small spatial difference between the two sub-frames in out-of-focus areas, as discussed earlier in this thread, but probably not a show stopper.

Maybe I am terrible wrong, but I think it is not necessary to implements dual iso in this camera. It's almost iso invariant, and the dual pixel raw technology gives you the 1 stop difference in one frame (well, is not one frame after you separate the dual pixel frame) that put this camera even slightly above the best DR cameras.