You might want to listen to the latest pod cast on the site. Scott is now saying what he hears is that it's a contract issue, not technical like he said before. NBC want's USA/Bravo/CNBC/Sci-Fi bundeled together with some interactive Olpympic features. So if that's true then it's the good old Charlie trying to save you money delay.
Time Warner just announced they were adding SciFi HD, without USA HD and CNBC BRavo HD, so I dont think that is an issue, could be wrong though!