About 145km (partly downhill) before anything will start and the climbs not terribly difficult make this makes this potentially a boring stage.
Stragglers way down on GC will break, and a train will quickly push over Ramaz and Gets, slowly dropping riders, down to about 50. Maybe someone strong, but lower down on GC will jump, and likely some climbing domestiques, but not get too far (LL Sanchez? Gesink? Kreuziger? Horner? Vino? Pineau? Voekler? Karpets? Basso?)
Up the Avoriaz the main group will thin to some 30 riders. Don't expect Contador to attack until the last 500m, unless someone else does that is a threat and looks strong, and he follows.
It benefits Contador to do two things: 1) Show he's strong and no one can really drop him and he's tranquillo. 2) Let Evens or Schleck take the Maillot Jaune. If one of them does attack hard under 5km, he may go with them.
Don't expect Armstrong to do anything but follow the main group and show he's there. In 2000 he may have attacked here, not 10 years later.
Weather may be a wild card. Cool, cloudy with showers may neutralize some attacks, inspire others to take chances.