I've installed the iOS8 GM. How do you use HomeKit? I understand it doesn't have a central app. I've tried asking Siri about it and she doesn't seem to understand. EDIT: I've figured it out but can't delete the thread. HomeKit is a developer framework, not a user facing app. Devs will build apps and plug their devices via their apps into iOS using HomeKit. Siri will then understand how to manipulate those devices.