We were advised by our salesman that we most assuredly wanted the "Artic Package". When I asked what it was, I got the greatest rendition of a soft shoe ever seen...... I think it boils down to thermo-pane windows (a good thing). Beyond that, I don't have the slightest idea.
I have under-floor insulation (see it at the top of the basement compartments), but I thought that was standard. I do not see any plugs for an engine block heater. I doubt if there is any wall insulation based on how quickly the interior heats up or cools off without AC or heater running.
The next time someone takes a factory tour, be sure to ask.....