Here's the Stage from another angle - a nice behind-the-scenes video, including the ridiculous-ness that is the publicity caravan, about 3 minutes in.
Tignes is a frequent base for altitude training of French sports teams. Stade Francais are regular visitors, for example. However the most notable recent guests were perhaps the French football team, who spent some "quality time" together in May 2010, before their disastrous South African adventure. Look out for Franck Ribery, who looks particularly reluctant as the happy campers take to the chairlift with their snowshoeing kit in tow.
More on the skiing in Tignes here.