I’m not 100%, but I believe the diesel hybrids will be running in an exhibition class, not an actual competitive one (similar to Porsche running that GT3 hybrid at 24hr of NuR).
They’re running two of each car.
My boy McNish ran the the fastest time during testing… Using the #2 e-Tron car. He put the #1 e-Tron car into a wall just before that though.
EDIT: The hybrids are running in the regular LMP1 class.
http://www.lemans.org/wpphpFichiers/1/1/ressources/Pdf/2012/journee-test/entry-list-test-day-24-heures-du-mans-2012.pdf