IDG’s Fred O’Connor:
People looking to control their HomeKit-compatible devices when they’re away from home will need an Apple TV to complete those tasks, Apple confirmed in a support page for its smart home platform.
As long as the same Apple ID is used to log in to the iOS device and Apple TV, people can speak commands to Siri to control HomeKit-compatible products.
HomeKit requires at least a third generation AppleTV which is, of course, the only AppleTV Apple currently sells. For at least the next six days.