The Wall Street Journal offers this report. See also this BNA report ($).
I understand that CSPAN has put in a request for the release of the oral argument audio immediately after the September 9 Citizen United argument, as the Court has done in some high profile cases. But there’s nothing yet on this page, and we are getting close to the argument. So I am not optimistic that the audio will be released. That would be a real shame, given the high public interest in the case.
A transcript, however, will be released some time that afternoon.