I'm thinking of designing a hood specifically for our cold Canadian winters. It will have heating elements in it run by batteries. You could even make one that covers the better part of your cameras so it doesn't freeze up as well. Of course I will have to design a little tiny lens scraper so I can get the ice off the front element of my lens as well.

Of course this will have to wait for my current project which is to design an underwater housing for my wooden field camera that will allow me to use my Grafmatics so I can get off at least 6 shots underwater.