Onegai Cinderella CD soon

Apparently [1], there's a new CD for Cinderella Girls coming out soon, "Onegai Cinderella". No legacy cast, Rin is in [2]. I look at all this and just ask, when is this going to end? Obviously it ends when people stop buying all this, but when is that? CDjapan has 24 first press slots still unallocated less than a month before release, so maybe it's now.

[1] It's in Japanese, I cannot be sure that I understand it right. The news item itself deals with seiyuu putting up a promo appearance for the CD.

[2] For some reason I haven't yet warmed up to Ayaka Fukuhara's work, but undoubtedly Rin is the most popular of Cinderella Girls.