Siri, did you enjoy the film?
Yes, Sam, very much
How many stars out of five would you give it?
Four.
Thank you, Siri. Would you like to go to dinner?
No thank you. Would you like to play a game?
Well the 'trailers' part is just an excuse. Its real purpose is to provide the showtime and ticket purchase facilities which can then be hooked up to Siri to automate all of this. Apple currently uses Rotten Tomatoes for its movie ratings on the iTunes Store, but as you mention the integration of the iTunes Movie Trailers App, Siri and user feedback is likely the future plan to replace any reliance on third parties.
The next step for Siri is e-commerce; to integrate purchasing of tickets & table bookings through the voice interface. The original Siri (prior to Apple) did this and its only a matter of time that Apple re-introduces it with that extra bit of polish and automation through the iTunes / App Store CC account.
