I was reading the inside of the 6th edition where it listed all the changed.
There's a few minor changes
Updated Canada census information
2 chapters of the text have been replaced
and
Chapters 5 and 17 have gone through drastic revisions
You can find it here:
http://www.amazon.ca/New-Society-Rob...40860& sr=1-6
The whole book might be there, I'm not sure. But if you go a few pages down you get to the page where it lists the differences