I know that lots of iOS developers use Testflight for their beta users so hopefully as more go cross platform this will make life easier for managing iOS and Android deliveries.
According to TestFlight:
“Team management and ensuring device coverage in the fragmented Android ecosystem are still needed points for developers during the beta process. TestFlight for Android is going to help solve these problems. It will also create a single dashboard for both iOS and Android so its easy for developers to keep track of all of their app beta testing from one place.”