I don't hold my breath on that.
I just checked for 128GB (which is already above what most people buy except for the Switch) and UHS-1 prices went from 20-60€. UHS-II started at 140€, and I couldn't even find just one UHS-III, let alone a SD-express card. Of course with such a price difference only absolute enthusiasts or people who absolutely need the plus in speed will buy the faster ones
So no blast processing for Switch systems. What a shame.