Apple added its Worldwide Developer Conference keynote live stream channel to Apple TV Monday morning, giving everyone that can't be at the event another way to watch as it happens. The channel should appear automatically, and promises to start streaming at 10AM pacific time when the keynote begins.
Apple adds WWDC keynote channel to Apple TV
The keynote will show off iOS 8 and OS X 10.10, plus it's likely Apple has a few surprises in store, too.
If you don't see the WWDC channel on your Apple TV, try restarting by disconnecting the power cord or by navigating to Settings > General > Restart.