"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple Seeds Third iOS 9.1 Beta to Developers
The new beta of iOS 9.1, build 13B5130b, is available as an over-the-air update and through the Apple Developer Center.
iOS 9.1 includes new features for the iPad Pro, adding support for accessories like the Smart Keyboard and the Apple Pencil, both of which are deeply integrated into the operating system. It also includes features that will allow the iPhone to interact with the new Apple TV.
iOS 9.1 also includes Unicode 8, adding support for emoji like the taco, burrito, cheese wedge, middle finger, unicorn head, and more, plus a new Messages option in the Settings app, allowing users to disable photos for their contacts.
It is not clear when iOS 9.1 will be released to the public, but it's likely it will come in late October, coinciding with the launch of the new Apple TV.
Update: Apple has also released a third iOS 9.1 beta for public beta testers.