Sorry guys I still have to bet heavily that a 7D2 will have a different sensor than a 70D. There's just no way they will let you have the "best" sensor for $1200, when they're trying to use it to sell a whole new camera category for twice the price...like a 7D2 in a pro body, in order to use the triple 18650 batteries to achieve 11.7 volts...It's a shame all cameras don't use these, they're fabulous. I've been using them in LED flashlights...and I can't seem to make them use up their charge...3 months later! Of course I don't use them very long on the "high" setting, but still...absolutely annihilates rechargable AA batteries! The whole idea of AA batteries is inferior and out-dated...
It's possible there will be two new sensors though...perhaps a 20 and a 24mp. Therefore the old 18mp sensor will finally pass into history...or not.
Or, it's possible that the 70D will be priced closer to the 7D's initial price...in the $1500+ range, body only. In this case, I will grant that it's possible they both could get the same sensor. But for $1500, the 70D had better have an AF sensor (and the processing speed to keep up with it), at least equal to, if not superior to, the previous 7D. And max frame rate had better be at least 7fps, if not 8.