Haruka Shimotsuki and Noriko Mitose have been already confirmed since last week when the newest characters and game systems were revealed in the most recent issue of Dengeki PlayStation. 4gamer's latest article for the game also echoes this. This was already a given, as since they were in Ciel Nosurge, it would make no sense to not bring them back for this game, especially considering that the character for who Mitose sang in Ciel Nosurge is also making a reappearance in this game.
Good to know. Hurray for more Haruka Shimotsuki! I'm confused as to why CDjan lists something different, but w/e. Maybe the entry is for something else and I am just dumb. x_x