The official website for Shion Sono's Exte - Hair Extensions (Ekusute) is online, although at present it's just a home page.
The screenplay for Exte - Hair Extensions was written by Sono. The movie stars (listed order corresponds to order on official website) Chiaki Kuriyama, Ren Ôsugi, Megumi Satô, Tsugumi, Eri Machimoto, Miku Satô, and Mirai Yamamoto.
Toei Company Ltd. (Tôei K.K.) plans to release Exte - Hair Extensions theatrically in Japan in February of next year.
Those who are interested in Exte - Hair Extensions may also wish to read the ScreenAnarchy article on Sono's Kikyû kurabu, sonogo.
Exte - Hair Extensions official website
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Kikyû kurabu, sonogo official website (w/ trailer)