The Official website of the already mentioned anime (won´t bother in writting it such long name again) has announced the premier date, which will be in October 1.
Takeshi Furuta is the director and scriptwritter at A-1 Pictures.
Anime News Network describes the storya s follows:
“The anime’s story will start where the third season left off, at the competition for who will open the Triple S international sporting event. Raging Entertainment’s HE★VENS idol group had hijacked the competition between QUARTET NIGHT and ST☆RISH, causing chaos. However, after the QUARTET NIGHT members suggest a certain idea, the three groups aim toward a new stage, with HE★VENS swearing to get their revenge on the other two groups.”
Via: Anime News Network