Assuming the audio quality is on par with a Sonos Play:1, An extra $150 is a quite a bit more to pay for Siri integration. Also, will HomePod only work with Apple Music? Another must have that I would need to see before switching from Sonos is the ability to create a stereo pair with 2 speakers.
Only Apple Music. It can create a stereo pair. It's not going to be anywhere close to Sonos in terms of audio quality. 7 tweeters and one 4-inch sub?
From what I understand it's going to use Airplay 2 and should be compatible with all Airplay compatible apps once they upgrade to the new technology.