> The lawsuit cites numerous news reports that point out similarities between Google’s new product features and systems that Sonos had already pioneered, including synchronizing audio across groups of speakers, adjusting the group volume, and setting up devices on a local wireless network.

This makes Sonos sound like a common patent troll. Sounds like sour grapes to me.

I remember iTunes doing synchronized audio well years ago and Sonos didn't make a peep.