For what it's worth...
I downloaded DPP 3.13.20 with support for the 70D and compared the imaging-resources samples from 70D/7D @ ISO 3200.
The 70D actually shows less noise and according to the histogram about half a stop more DR, all lights being equal...
Take a look at the screenshot @ 100% pixel peeping! (70D to the left), at:
That's a ho-hum improvement in my opinion. 4 years and that's the only improvement Canon can do? Makes me glad I abandoned 1.6x crop altogether. The recent rumor that the 7D2 will likely get the same sensor as the 70D, is also a bit disappointment.