According to espn.com, they speculate it will probably be Oklahoma vs LSU for the national title.
USC gets jobbed big time if it happens. Screw strength of schedule, they are the best team bar none right now. This is a nightmare for the BCS is USC doesn't get allowed to play for the title. As a Michigan fan, I'd rather see USC beat Michigan just to stake claim as the real national champs. I'd like to see a USC-Oklahoma matchup myself.
ETA: One more thought, I thought the BCS would eliminate split national championships.