I'm conflicted on whether the idea of a standalone Echo-like device is something that makes sense. I'm one of those people (along with my wife and each of our 4 kids) who always have their iPhone with them, so having a standalone device would just be yet another electronic device sitting somewhere taking up space and consuming electricity waiting for the occasional use when I or someone else is in the vicinity and wants to ask for something.
I get the real use is likely as a home automation hub, but we're not there yet with home controls and the internet of things. And how commercials show these things playing music - it just reminds me of the transistor radios of days past, where my grandparents would be happy with the sub-par, mono, sound they produce. I would be interested in Apple getting into the remote / distributed speaker market where each set of speakers would include a microphone, so you could Hey Siri to any one speaker that is connected to your home wifi system. That would make sense - but only if the sound quality and physical looks are good.