I have called them a couple of times and they are unable (like all other schools) to give any information out about time lines. Since they have their whole system on computer, the office staff even say they are unable to determine if the application has been reviewed or not. They only say that it is out for review.
They are not on a rolling admissions scheme and interview all the way up to March (I think). I guess that is supposed to make us feel better, but I kind of like rolling admissions. Anyway, I guess that means no one hears their final status (after interviews) from USC until the spring.