Number of 7 and 8 Toyotas will not finish, based on demonstrated reliability issues that I think are mostly related to their hybrid system.
Number 2 Audi will have a debilitating crash because of the habit of overly-aggressive driving by this trio, particularly McNish. If the Number 2 Audi manages to finish in spite of this, it will be a podium contender because of the poor performance of the Toyotas. All of the Audi's are podium contenders (I'm really going out on a limb here). However, if there is a lot of rain (some is predicted), Audi's engine exhaust system may compromise the rain tires by heating them above their optimal operating temperature causing excessive wear and putting the at a disadvantage relative to others.
Rebellion Racing has a strong chance of a podium finish based on the predictions of the above three cars (2, 7, and 8). Rain will further help Rebellion Racing by bringing down the lap times and making reliability, driving discipline, and fuel consumption greater factors (relative to dry lap times) in the race outcome.
GTE Pro should be a very competitive class and the outcome more or less a toss up between the factory teams.
My picks and Rachel's for all classes will be forthcoming after qualifying is finished.