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) and much more. The clock's ticking!