With iTunes 4.9, you can now browse and subscribe to podcasts from within the iTunes Music Store. Podcasts are frequently updated radio-style shows downloadable over the Internet. You can also transfer podcasts to iPod, for listening on the go.
As of 2AM PST (the time here on the US West Coast), there is no Podcast section on the iTMS. Apple is probably waiting for an announcement or official release later this morning.
There appears to be no other changes to iTunes whatsoever.
[edited by Nate]
