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... on which there is zero info about either the Spark or the Aveo?

Yay GM Canada and your clever advertising!

Looked at that ad again and noticed a couple of interesting things:

First: the RS concept has no door handles on the front doors. (The actual concept did.) :)

Second, the legalese small print...

I would... if I had a scanner #-o

In the current issue of Maclean's Magazine - Canadian news weekly, back cover...

(Sorry for the crappy pic...)
...