Google is putting its Chromecast technology into speaker now, and is looking to make it easier for users to connect media players to sound systems. It works is essentially the same was as the Chromecast, although there is no additional hardware to pick up besides the Google Cast compatible speakers.
Apps compatible with Google Cast for audio will soon be seeing a new button that to broadcast the stream to a compatible speaker instead of continue playing from whatever device it’s installed on. For smartphones, this also means that music will continue to play even while taking a call. Google’s blog post indicates that the speakers will take over streaming, and the music is directly downloaded from the cloud; leaving the smartphone, tablet or computer to simply tell the device what song to play next.
There is a large number of apps that are compatible with Google Cast, although Spotify is notable missing from the list that includes Deezer, Google Play Music, Rdio, and TuneIn.
So far only three manufacturers have been confirmed to be building speakers for Google Cast, with Sony, LG, and HEOS by Denon set to release their takes on the devices in the near future.
[Source: Google Chrome Blog]