As pointed out in the ISO samples review, judging the Canon EOS 70D by its still image quality is a bit of an academic exercise. The advancements made in the sensor department have nothing to do with improving resolution or dynamic range. In fact that the 70D shows any improvement over the 60D in these areas is largely despite of the new Dual Pixel architecture, not because of it.
However, in playing with the live view and video autofocusing, the promise of faster and more reliable does come through. That doesn't mean that the 70D is prodigious as a video rig; it's more a case that the new focusing technology finally makes the traditional DSLR work as a usable videography machine....period.
Thanks once again to the kind folks at Broadway Camera.