You can find it at http://starcraft2.com/swarmlaunch.
If you prefer watching from Twitch you can find an event page with all relevant streams at http://twitch.tv/event/swarmlaunch.
The Australian event actually starts 4 hours and 45 minutes from now over on http://twitch.tv/starcraft_anz but will not be the first event to kick off the global stream.
So happy to finally be getting the game into all of your hands. GLHF!