I'm kind of curious as to whether Apple intend on opening up Siri's APIs to third parties like AVHD. There already seem to be a few third-party apps that have some kind of Siri integration.
Personally I'd love to see the ability to jump to a particular time point, enable/disable subtitles and locate and display metadata from IMDb or other similar service, although I do appreciate that this last one would be very difficult to achieve.
Having said that, AVHD is already a superb means of playing videos both locally and remotely. Simple, elegant, effective—can't argue with that