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So just to keep an update coming: so far no improvements.  My traffic did drop by about 25% between two days ago and yesterday.  I did find one failed sitemap in google webmaster tools.  I'm not sure if this would have an effect on this or not, but I've re-submitted that, so maybe that will help!  Hopefully I'll see things back to normal soon or at very least webmaster tools will tell me what's going on!

The canonical tags are definitely applicable to this situation once Google goes everything again and sorts it all out with the new tags.

Here's a nice e-Consultancy article with come clear things to check against: http://econsultancy.com/blog/9848-monday-morning-panic-stations-18-checks-to-make-when-your-sales-are-down?utm_medium=feeds&utm_source=blog