iTunes 10 includes some refinements including; syncing and connectivity, improved organisation, UI and new ways to view your music and video.
Commercial-free HD episodes available to rent for just 99¢ each (from Fox and ABC). You have 30 days from the moment you rent an episode to start watching, and 48 hours to finish it.
Finally and most significantly however, Apple is announcing “Ping”, a social network for music with a starting user base of 160 million iTunes users in 23 countries. Make no mistake about it, Ping is Myspace as it should have been. Full details on Ping can be found here.