Clock-wise starting from the left:
Miyamoto Karin (14) - Joined H!P in 2008. Participated in the 2011 S/mileage audition, as well as the 2011 Morning Musume audition. Was a member of Shin Mini Moni.
Takagi Sayuki (15) - Joined H!P in 2009. Participated in the 2011 S/mileage audition, as well as the 2011 Morning Musume audition.
Otsuka Aina (14) - Joined H!P in 2011. Was a finalist in the Morning Musume 9th generation auditions, and also participated in the 2011 S/milage and Morning Musume auditions.
Uemura Akari (14) - Joined H!P in 2012, after failing the 2011 Morning Musume auditions. Participated in the 2012 Morning Musume audition.
Kanazawa Tomoko (17) - Joined H!P in 2012, and was a finalist in the "Ocean Music Award Shinjin Hakkutsu Audition".
Miyazaki Yuka (18) - Was a finalist in the S/mileage auditions, and joined UFP after placing 2nd in a different audition. Part of the Satoyama subgroup "GREEN FIELDS".
I'm assuming they'll start off as an indie group until they decide whether they're keeping them for the long-run.