It seems to be a pretty small difference and sometimes a benefit on catalog games. From the Steam thread:
"It's only sometimes (most of the time?).
For instance, AssCreed2 right now is on sale for 5$, same as the American price (though the Canadian dollar is lower so it's actually cheaper here) and I've noticed this on a few games.
Using Enhanced Steam, it'll tell you the American price in Canadian dollars and, even with the new adjustment upwards, we still sometimes save a few pennies. For instance, the Dark Souls 2 DLC is $9.99 USD, which is equivalent to $11.16 CAD, but it's listed as $10.99CAD
So we save 17 cents there. "
" It appears Capcom loves Canadians. Everything is in the same price as the American store but in Canadian dollars. Thanks for the 10% discount from your laziness Capcom!
Also, back catalog Ubisoft titles appear to be equivalent price too. Not the new stuff though.
"