If you want to watch Apple's big announcement on Sept. 7 [1], you've come to the right place for all the details. Starting at 10 a.m. PDT, you can live stream it from this page on Apple's website [2].
The catch is that you must use a Safari browser on either OS X 10.8.5 or later, iOS 7 or later, or on a PC with Microsoft Edge on Windows 10. If you have a second- or third-generation Apple TV with software 6.2 or later, you can stream it there too.
So, what should you expect? Fingers are crossed for a new iPhone(s) [3] and much more. The clock's ticking!