Since I subscribed to google play music, most of my music listening have been done on this service. I got the Axiom Air on Kickstarter and I think many user would benefit having google cast functionality on top of Airplay.

Having both service would remove the need to be compatible with all major music services and still satisfy Android and iOS users.

Is this in the planning? If not, do you plan on releasing the source code soon to let the community develop plugins?