You can't compare apples to oranges, And you can't compare new technology to old. Whatever advances made in the 70 D will eventually trickle its way down(up?) to the 6D Mark-two. I believe that the next camera announced by Canon will be the 7D2, And the next year will probably be full frame upgrades. In the short-term the APS-C cameras may look quite competitive against full frame, But once everybody is playing with the same technology we should be back to the same relative differences as we have now
I would not be too sure about FF upgrades by next year. 2015 might be the year for that. But we might see a high MP count sensor body applying the 70D tech (?). Anyway, what imho really matters is a new sensor fabrication process.