Levi will attempt to attack two times, and they will both end up like every ofther TdF mountain attack he has staged in the past 2 years: each attack will last for about 5 meters before he is re-absorbed.
As mentioned by others here today, Levi simply does not have it in him. Handling Jens Voigt in the Tour of California in February is not the same as attacking the field in the TdF.
Contador will put some time on Rasmussen and win the stage, but not enough for the Yellow Jersey. I have the feeling that if he could, Contador would take a "natural break" on Rasmussen on the way up. No love lost there, as it seems.