It doesn't mention allowing the Amazon Echo/Alexa to control your Sonos speakers. Not explicitly stating this fact implies that they will be cooking up their own dedicated voice control. This is a huge mistake.
I was actually considering upgrading my current TV speakers to a Sonos system, but since they didn't work with Echo I decided to hold off. Bottom line is that I won't buy Sonos speakers unless they work with the Echo. Any delay in time to market on the Sonos side is just stupid, so why waste their time developing their own voice control system? I'm also not interested in having two devices control my home automation. Sonos management is blowing this one.
One last thing, I ordered an Echo Dot that I can plug into my existing TV speakers (a Vision 5.1 wireless system). It may turn out this works just fine for me, and now I may not upgrade to Sonos even if they did integrate their speakers with the Echo.