Hey Shane! Welcome to the CL forum
From my experience of shooting in cold weather (not huge but nonetheless) the lens has never fogged while going from warm indoors to cold outdoors. It has always been the opposite and this makes total sense as cold glass will draw condensation in a warm "humid"
I've heard some people place their cameras in a ziplock bags prior to going back inside as this allows the camera to cool down less rapidly and also in the same air as outside which might inhibit fog.
I think this can work but can further be improved. What if you were to keep, inside the ziplock bag, 1 or 2 of those little desiccant packets of silica gel which would draw any of the humidity from the air inside the bag. Therefore, when your camera warms up inside the bag, there won't be any water vapor that could condensate on the cold lens as the air will be dry. (What do others think, as I've never tried it myself ... I think it can work quite well though)
Hope this helps!
P.S. As TheHawk said though, the fog effect could still be neat