Likely for the start of the third year of the series.
New Ending starts in April 2019
The ending will be by the idol group BiS, singing the new song “Are you ready?”. Much like what we’ve gotten out of the show recently, despite the group being idols, they’re more hard rock/emo/punk/ska, and are intentionally a more alternative style of idol, rejecting the cutesy giggly vibe of most idols.
So basically expect something along the lines of Glory.
Source: V Jump