At AnimeJapan 2016 (source AnimateTimes) it was once again confirmed that Ensemble Stars! will get a TV anime scheduled for autumn 2017.
Ensemble Stars! is smartphone game for Android (Google Play) and iOS (App Store) devloped by Happy Elements K.K. that was released in Japan in april 2015. The game revolves around idol groups and song performances. For more information about the game visit the official website: http://stars.happyelements.co.jp/.
Trailer to the game: