It’s HomeKit, yes. Apple is now going to provide its own built-in app like it does for mail and messages.
However, until they enable “accessory triggers” for Bluetooth devices, HomeKit is really limited for home automation.
For example, right now with the Elgato eve contact sensor, you can open the app and see the last time a window opened, but you can’t get a notification when it does, and you can’t use the sensor to trigger anything else. So you can’t use a motion sensor to turn on lights.
Apple has described the capability, and even uses the motion sensor example in their own marketing materials, but as yet it’s just not enabled. You can trigger on geolocation or on time, but not on a Bluetooth sensor report
I didn’t see anything detailed yet from WWDC as to whether they will enable this in IOS 10.
Until they do, homekit is only half of an HA system. ( and I say that as someone who has some HomeKit devices and likes them.)