Apple invites everyone to “watch streaming video from this special event and learn more about our exciting announcements.”
Live streaming video requires Safari 4 or later on OS X 10.6 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.
On June 2nd, the live stream can be accessed here.
Source: Apple Inc.