METROPOLIS is a new Idol project created by the production staff of UNDER FACE, the sub-unit of Smile Gakuen (スマイル学園). METROPOLIS is not related to Smile Gakuen now and it's formed by different girls.
However, the concept of METROPOLIS is almost the same of UNDER FACE.
Official twitter account. Updated by the girls.
Official twitter info account. Updated by staff.
Their official website is on development, I'll update when it's ready.
It has not been announced the date of their debut.
Logo.
Right now there are 4 confirmed members:
Yamaoka Ririko (山岡リリコ)
Twitter: @ririchanman1007
Blog: http://ameblo.jp/momo-riri-chan/
Agency: She doesn't seem to be affiliated to any agency.
She's a 10 years old Idol fan and aspiring to Idol.
Asahina Ren (朝比奈恋)
Born: January 25, 2000 in Aichi. (14 years old)
Blog: http://ameblo.jp/r1e2n5
Agency: AUI (official profile page)
She's a gravure junior Idol who is now debuting as singer with Metropolis. The group manager says she has a tomboyish personality, but I haven't seen that.
Hayasaka Misaki (早坂美咲)
Born: October 29, 2001 in Tokyo. (12 years old)
Agency: AUI (official profile page)
Iida Amiri (飯田愛美鈴)
Born: July 5, 2000 in Saitama (14 years old).
Agency: AUI (official profile page)
I don't know much about her, except that she has released DVD's like the previous two members so she's a gravure junior Idol. Metropolis Contact says she's shy.
Samples of their future songs.
It has been announced that METROPOLIS will have sub-units, but it's not clear yet which girls will form each unit.