I am for one hoping that the Digic 6 will in combination increase the useable ISO and speed on the 70D
Hardly - a faster cpu might do better jpeg noise reduction, but you're still better off shooting raw and doing selective nr in post. For iso/dr, the sensor is the component you'd have to upgrade, and Canon obviously either isn't willing or able to do it. The DIGIC6 might do better video af, faster video (1080p/60) or more fps though.
Hmm, It seems I missed the "with the new sensor" after "in combination". Yes, you are ofc right. I was thinking that it might be some debanding, denoising etc software at work even on the raw pics, and the Digic 6 might handle that.