I was shooting at -20 celcious in the last winter. Shot over 100 pictures for 2 over nights.
I was using K100d super that time. It seemed to work fine in cold dry conditions - Moisture may be different so make sure you keep it dry.
Take a spare well charged battery. Keep it in an inside pocket, or a warm as your body heat can keep it. Two spares are better if you can get a second. Cold really seems to kill the battery charge.
Try for gloves that enable you to manipulate the camera controls. Freezing fingers tend to be clumsy, but big gloves are cumbersome so give the matter some though before you arrive on site.
Taking you camera from warm to cold, or vice versa can cause condensation on the inner lens. Get a large zip lock bag for transferring from hot to cold or vice versa. The cold will cause the ziplock to sieze, so try for air tight seal.