No, CS6 won't be of any use. The 70D requires ACR 8.2, which only works in CC - unless, of course, you care to use the free DNG converter. Otherwise separate versions don't interfere with one another, but naturally you would have to save your images as PSD or TIFF or whatever to use them in ID.
I thought that CS6 would always accept Camera RAW updates, but without some of the functionality it would have in future CC versions. It would be a poor show to cut none subscription customers off at the knees with all those new camera models that will appear over the coming years!
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ACR 8.2 works for CS6 as well. Current live release is 8.3 for both CS6 and CC users.
For CS6 downloads, Please refer:
Indesign and PS coexist irrespective of versions.
Do you have Lightroom 5? If so, I think you can use it to convert your 70D files to DNG on import, which you can also open in CS5.
Otherwise, you can use DNG Converter 8.3 to create DNG copies, though it adds an extra step (if you can handle it).
I don't know how upgrading to CS6 (which DOES support Camera Raw 8.3) affects In-Design. I've had mixed CS5/CS6 on my PC in the past without any problems.