It appears to be true! Check this out - https://www.engadget.com/2017/08/28/sonos-alexa-speaker/
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Indeed true, another news on this topic, Oct 4th is the day:
https://www.theverge.com/2017/8/29/16219474/sonos-voice-assisted-speaker-event
https://www.theverge.com/2017/8/29/16219474/sonos-voice-assisted-speaker-event
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