Interesting "Talk to a Sonos" app, appears to use Google voice recognition. Installed the free version this morning, which found all my Sonos devices, playlists and favorites. Even recognized the stereo-paired Play:1s in the office, unusual for a UPnP service, which will normally find two individual speakers.
Will play with it this evening. Has an always-listening mode for docked phones/tablets; I have a docked Nexus 7 in the LR that's a dedicated Sonos remote, should be interesting.
https://play.google.com/store/apps/details?id=com.talk.control.upnp&hl=en