Looks like Dave Winer is onto something: According to the podcasting guru, "Tuesday is a big day for iTunes and podcasting." Could it be the launch of the podcast-friendly iTunes 4.9, previously said to be coming on July 7th? Winer also says Apple will unveil a major corporate content partner in conjunction with the iTunes announcement.  Who will it be? My bet is on Grokster; now that the Supremes have slapped them down, they're going to go legit and partner with Apple.

[Via Tuaw]