Not full face, but someone recently posted (can't remember where or whom) that they use a snowboarding helmet similar to this one in the winter:
Good idea as I think regular cycling helmets do not protect well enough the back of the head (occipital lobe). It would also provide greater warmth without having to wear a cap underneath further reducing the effectiveness of the normal cycling helmet. I will stick with my regular cycling helmet for the summer because of the better venting, but I expect to buy one of this style for next winter.