Sounds like the whole Siri (requests, Proactive) might be making its way onto the Apple TV, with the same newly added Spotlight APIs to expose content to Siri. Wonder if: a) Handoff will be there as well, that'd be neat, e.g. start Netflix on the Apple TV and continue on Netflix for iOS, start Media on iPhone and resume on Apple TV; b) Will the App Store really be on the Apple TV? Or can we have the same model used with the Watch? The former would make it a standalone device but at the expense of experience, and with so many Apple-specific features in there already (Home Sharing, AirPlay, apps—Podcasts, Music, iTunes, Remote), why bother creating a device for people without an iPhone, those will use Chromecast and all the other stuff out there.
Next step would be bringing OS X closer into this circle, probably after El Capitan and with the death of iTunes.
Anyway, looking forward to 09/09/15.