I can feel the stillness of the cold air in those photos. You're making me even more impatient for winter.
Chris, shooting in the cold isn't too different from normal. Battery life is cut short, and you need to be careful about condensation. When I'm in the backcountry, I sleep with my batteries to keep them warm. The camera goes into in a sack and buried in the snow to protect it from temperature changes. If you bring the camera in the tent with you, it'll take hours for the condensation to clear.