The 70D will be a killer when it comes to live view and movie recording, in no other way does it really seem all that revolutionary, as we have seen all its features on other cameras. The only absolute new thing added to this camera is its 40mpx sensor that can AF across 80% of the sensor when the mirror is up, everything else has already debuted elsewhere. It indeed is a very nice step up from the 60D however, that is sure, but not necessarily in the IQ department, but certainly in the features and function.
I'm not so sure if I agree with your understanding of the 70D's sensor. Base on my understanding of the Dual Pixel AF, you're not really getting a 40MP sensor where half of it is dedicated to PDAF. If that's the case, then each individual pixel will be very small (smaller than even the 60D's pixels). I could be wrong, but I don't think that's what DPR said in its explanation of the technology.