I had a thought regarding how the sonos integration may factor into the Echo Plus. The Plus is supposed to boast to have a smart home hub built in, so you don't have to have a separate phillips hub (for example) as well. There hasn't been much said but it's supposed to boast Alexa features built in to your smart home scenes. In other words you can script commands to turn on a light AND play a radio station, for example.
I would assume then, since Alexa now has a lot of control over sonos, that a sonos zone can be included in these smart home scripts. Is there any confirmation on that?
BTW, I know that you can do this with other third party hubs already, just seems like it might be more integrated with the Alexa smart home since Alexa is more aware of the 'state' of the sonos zones. Also, I've heard little about the Echo Plus capabilities. Not much on supported devices, scheduling capabilities, or any conditional logic.