I suspect that it will be a feature reserved for the eventual high end R series. Since the R5 will have a new sensor, its entirely possible but unlikely. We've seen patents for this sort of thing in the past, it was a matter of the ability to manufacture the sensor with the dual gain feature and still use the dual pixel for autofocus. That sounds pretty complex. There is little doubt that the dual pixel sensors are going to allow new features that are unique to a dual pixel design. The design also brings some issues, Canon has done very well at keeping side effects unnder control and they are of little consequence for most of us.