Unfortunately there has been no indication if Apple will stream the event for desktops or iOS devices, but we will keep you updated.
In just a few hours, Apple is expected to unveil a new iOS, OS X, and radio streaming service
Update: Apple has announced it will stream the keynote on its website for desktops and iOS devices here.
Live Streaming video requires Safari 4 or later on Mac OS X v10.6 or later; Safari on iOS 4.2 or later. Streaming via Apple TV requires second- or third-generation Apple TV with software 5.0.2 or later.
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via Mac Rumors