SmartThings is not even mentioned:
http://www.cepro.com/article/sonos_now_integrates_for_real_iport_and_lutron_launch_new_sonos_controls
Well the list of “partners” are the high end “professional” type automation systems. The interesting thing is why make this a private API when so many have already created integration with SONOS. Why not just make it open?
The real question is if the actual API will be blocked or not and if not if it will eventually come out any ways.