i called them too. the person i spoke to was extremely tight-lipped, and wouldn't offer up many details. she said that as of right now, there was no movement. she did say that that might change, but from the way she said it, it didn't sound likely.
unlike other schools, i haven't heard of any anecdotal stories of people getting off of the waitlist at usc in the past. has anyone here heard of such a case?