Personally, if the 7D2's sensor is as good as the 70D's, that will be good enough. It's not sensor performance that will distinguish these two cameras.
I mostly agree. However, again, based on marketing material alone, there better be some improvement over the 70D. If not, either the marketing material is a complete lie, or there truly isn't anything left for Canon to do with the current sensor design (including the circuitry/readouts/ADC, not just the imaging sensor itself) to make it better without a complete overhaul. They have to go to the multi-layer, column parallel ADC on chip to get better results.