Lars,
I might be wrong, but I don't think there is any special approval process for HomeKit (for example, like there is right now for CarPlay). HomeKit API has been out there for a while, albeit not much example code out there. All that might be needed is a homekit layer between the iOS app for almond and homekit. The rest should be pretty much the same. Now if you want to put "Made For iOS" logo on the router then thats a completely different thing.