Like Chrome Cast for video, but with without the video, for (audio?) devices without HDMI inputs ...
http://www.google.com/cast/audio/
http://chrome.blogspot.ch/2015/01/introducing-google-cast-for-audio.html
EDIT: Interesting that they have the root "cast" directory.
http://www.google.com/cast/
Hmm, whats next. Text cast (or should that be cast for text)?