Searched and nothing on Apple Homepod yet so I'll start this inevitable discussion.
I see the Homepod announcement as an opportunity for Sonos rather than an end. Now that they know what the Apple play in this area is, Sonos has little choice but to move more aggressively in a direction that may be better for most of it's present and future customers. That direction, in my opinion, is one of greater openness, increased integration with Google Home, Amazon Echo and other "smart home" technologies and an overall increased pace of innovation.
As someone who is quite heavily invested in Sonos, I look forward to watching this play out.