User blog comment:Pochichi/Aikatsu Stars Season 2... CONFIRMED/@comment-34587210-20170105131412/@comment-25034020-20170109045437

Koharu grew her hair out XD lol

It says A new academy and a new idol appear though so...I doubt it's Koharu unless Koharu is so different when she reappears that everyone mistakes her as a new idol  *shrugs*