The passage through Lourdes will be the ideal time to say a little prayer. It will be necessary.
Jonas is the best climber in this Tour. The fact that he's wearing the polka dot jersey proves it. He'll probably join the break, aiming for the KoM points. I also hope to see guys like Healy, Carapaz, Bardet, Lutsenko, Simon Yates, Gaudu and Lenny Martinez (#154 in the GC!), but it's unlikely that they'll get the freedom to ride for the stage win.
The Tourmalet will probably be drilled by UAE to create a selection of the best GC riders and their strongest helpers.
Pla d'Adet has its steepest part in the beginning, so it lends itself to attack from the foot. The most famous edition was in 1976, when Lucien Van Impe won the stage and took yellow.