As of this post, Apple’s web site is still up. In past years, this has typically meant no new hardware for immediate ordering. We shall see.
The keynote begins at 10a PT, 1p ET.
If you’ve got an Apple TV, watch in the Apple TV app (if you fire up the Apple Events app, you should get redirected). The event should pop up as we get closer to go time.
If you’re watching in browser, jump to Apple’s official Apple Events web site to watch there.
And checkout Michael Potuck’s 9to5Mac post for even more options.