A duology film that adapts the Stars arc from the original manga

The official website for Bishoujo Senshi Sailor Moon Cosmos, a duology film that adapts the Stars arc from the original manga, has revealed three new cast members from the first film.
Cast:
-Saori Hayami will do the voice of Taiki Kou
-Marina Inoue will do the voice of Seiya Kou
-Ayane Sakura will do the voice of Yaten Kou
This film produced by Toei Animation and Studio DEEN will be released in the summer of this year in theaters in Japan.