We've actually been looking at Google Play and Google Cast for a while. Unfortunately, while our interest is high, where we shake out at this time is that integrating Google Play or Cast into our existing systems is unlikely due to pre-existing technical differences and specifically hardware memory requirements. We are continuing to explore integration in future products that will not have the same technical limitations.
"integrating Google Play or Cast into our existing systems is unlikely"
So in effect, Bose have been stringing SoundTouch owners along for the past couple of years! Good luck with intergrating it in your future products but I'm making a complete crossover to Sonos and will get a Sonos Play 3 to replace my SoundTouch 20.