This event will be all about FaceTime I think, new iPod touches that match the specs of the iPhone 4 bringing in FaceTime. New Apple TV with support for FaceTime. iOS 4.1 that unifies iPod touches with the iPhone (no update for the iPad).
I don’t expect there to be any streaming info just yet, but TV subscriptions seem imminent.
Note: This site makes use of affiliate links, which may earn the site money when you buy using those links.