watchOS 3.2 update to add Theater Mode, Siri integration for specific apps
It is rumored that Theater Mode will be added to iOS in a forthcoming update, although the iOS 10.3 beta that's been released to developers doesn't have it. Still, Theater Mode makes more sense on the Apple Watch which is worn on the wrist as the iPhone resides inside a pocket or purse.
The second addition in watchOS 3.2 is SiriKit. Basically, any app with messaging, payments, booking, workout, calling, and photo searching functionality can be summoned through Siri, if its developers add the integration.
There's no timeframe for the watchOS 3.2 update, nor are there any beta releases yet. Apple will potentially add more features to it over the course of its development.