This is a poster from a store^
Here's the confirmation! The album is called ∞uppers and the ∞ stands for Patchi! So actually the Prologue of Patchi was the Prologue of 8 ;D
On the poster it says that it will be a special album, "The industry's first"!!! And all the mysteries around club8 and the prologue will finally be resolved here!!
Gah, I can't wait!! :D *waits for preorder links*