Some people are supposing that it's related to her Chinese drama with Rika at the time.
I'm thinking this fake......
also, according to the new edition of Animedia, this song is supposed to be a theme for new Kirarin Revolution movie, which should hit the theatres in May (around Golden Week). Tsuji will record the voice of Atena (anime character), so that's where the project name comes from.
Dammit Tsuji get your own show