Hi, I don't if you knew but apparently the athletes will sit (not 100% sure) after the parade. This information comes from our french athlete Tony Estanguet (Kayak) who was flagbearer in Beijing and who gave some advices to Laura Flessel: our flagbearer at these Olympics.
This is the sources (french): http://www.lejdd.fr/Jo-Londres-2012/Actualite/Tony-Estanguet-donne-ses-conseils-a-Laura-Flessel-porte-drapeau-francaise-aux-JO-de-Londres-533197
He says: "C’est aussi excitant que fatigant, mais je crois que, pour la première fois, on sera assis et non plus debout au milieu du stade."
In english :" It's as exciting as it's tiring, but I think that, for th first time, we will sit and not standing in the middle of the stadium"
I didn't knew that before now.
I'm just posting that because it shows that, the scene should be totally available for the cauldron's lighting scene.
Excuse me if this new isn't interesting to that topic, I'm just sharing what I know.