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DeltaGolf
Cold weather testing, perhaps? Wikipedia says that the Regal will be made in Canada starting in early 2011. (Currently, Regals for North American markets are made in Germany, while the Chinese version is of course made in China.) I'm just guessing, but perhaps the Canadian-made Regal will be different enough (because of locally-sourced parts) that it has to go through endurance testing like a new model.
It's possible that it was on its way to Lapland for testing, but it doesn't seem very likely. I think they could easily have found colder weather in Canada, and "secret" test cars are probably not painted in a easily notifiable colour like that.
I suspect that somebody who recently moved from the US or maybe China brought it with them, or maybe someone just found a Regal front (on eBay?) and bolted it onto their Insignia.