They've just announced the Sonos One, which is an updated version of the Play:1 with far field mics and Alexa built in. Airplay 2, Siri and Google voice control coming next year.
Meanwhile, the Sonos 8.0 app is out, I'm controlling Sonos via Alexa now, directly, no more analog link required. Alexa, play some jazz in the living room. Simple, fully integrated into Alexa. Discover Sonos devices just like Echo devices via the Alexa app.
Sadly, only the services supported by Echo are integrated, so no voice control (yet) for Apple Music or Google Music. You can bet they'll be enabled as soon as Siri and Google voice systems are integrated, though.