Okay, I actually drove a Grand Prix GXP (FWD) in the rain one time, and it was literally the scariest thing I have ever done. I will give you that it is a different feel to what I had driven before (RWD and AWD), and I understand that every drive setup needs to be driven differently, but that was just silly. It would spin the drive tires if I even breathed on the gas. That is scary to me as I tend to use my front tires to steer and, if they have no traction, it is quite hard to steer.
Anyhow, I am a firm believer in AWD systems, but the G8 wont be equipped with one of those, so I will talk about RWD. I can see the advantages of FWD in the snow as you will have a ton of weight over the drive tires because of the engine, but this doesnt change the fact that you are trying to steer with drive tires. Let me know how it works, but I would rather push the cart up the hill rather than pull it.