Rather than smear your screen with pork fat, Apple might have a more palatable solution for your cold weather needs. This latest patent describes a two-layer glove that includes a weather-protective layer and a layer compatible with a touchscreen display. The layer that protects your hand from the elements will include tactile feedback so you can feel the interaction with the display.
I am not sure how the Apple version differs from gloves already on the market, but as someone who lives in a northern climate, I would love to see a pair of these stylish "magic" gloves hit retail shelves of Apple Stores. Maybe they can throw them into some accessory bundle for us northern folks. And, hey, a pair of Apple-branded gloves has to be better than using a frozen sausage.