It's not often I feel completely speechless, but this stage has had that effect on me. Dan's preview below lays it all out nicely, and all I can add is that this race keeps getting curiouser and curiouser. OK, we can rule out a climbers' battle, but the escape and bunch sprint scenarios are definitely still in play. An even better scenario is where someone with mad descending skills sneaks away after the Passo Maloja, showing that there are innumerable ways to win a bike race. One thing we know: it will be a hard day in the saddle. Probably an entertaining one. And definitely a beautiful one, weather or no. Enjoy!
[And my pick... hm, I will go with Allan Davis.]