Game

Uma Musume - Pretty Derby (ウマ娘 プリティダービー) is a mobile game by Cygames and still under development.

Gameplay
While there is already some information about the characters it is still unkown what the actual game will be about.

In an interview with Famitsu one of the developers of Uma Musume stated that the current development status is around 25%. They plan to release more information about the gameplay at AnimeJapan2017. There is also a short statement about the planned release date: こ、今年のG1が終わるまでには…..！

You can find the interview here.