It’s defiantly a Kirarin Revolution unit. It will have three girls in it, one being Koharu, obviously.
Erika, Maimi, Saki & Kanna of C-ute will be announcing who is in the unit on Hello!Pro Yanen. We should know who will be in it soon.
Personally I think the two other girls look like Chinami & Yurina. I’m hoping so, because then this group will be full of win~