The team has been continuously working on stereo paring since October. The development process was interrupted several times with urgent manufacture issues. But we never stopped it.
It was much longer and harder than we expected. As Sugr Cube today, we still have some issue with single Cube AirPlay stability. So this is our highest priority to improve. Then we will work on the stereo feature. For multiroom, that's next step after stereo. Practically I worry about the multi-room performance. It is very much Wi-Fi network dependent.
Before we could release our beta test, you can try this Apple on Apple App Store to experience multiroom with AirPlay: https://itunes.apple.com/cn/app/whaale-music-radio-disco-player/id625829705?l=en&mt=8
Bottom line, stereo & multi-room feature would be our experimental products, we cannot guarantee the performance now.