Apple TV owners have probably noticed that the 'Apple Events' channel has returned to their main menu this morning. As with previous events, this channel will allow you to watch a live stream of today's iPhone keynote—although clicking on it now just brings up a splash screen with the start time and other details.
Apple will also be streaming the event live to its website, where users running Safari on OS X and iOS will be able to tune in (sorry Windows users). For those that are unable to watch live, Apple typically uploads a video of its event to its YouTube channel within 24 hours or so, or you can simply follow along with us.