The new Apple TV is rumored to sport a buffed up A8 processor, a new App Store with downloadable apps, and Siri integration. The former two are important, but the event is titled 'Hey Siri', so we know the feature will be the main focus at the keynote.
Over the weekend, Apple updated Siri internally with a few corny jokes when prompted "Give me a hint". Some responses that the artificial intelligence currently replies point to tomorrow's event. Pop out your iPhone and give it a shot.
Apple's Hey Siri event begins September 9 at 10 AM PST and will be live-streamed for everyone to view. The fruit company is expected to unveil the iPhone 6S and 6S Plus, a new Apple TV, and improvements to iOS 9 and watchOS 2. We'll have full coverage of the event on iPhoneForums.net.