The album will have three different editions; a limited time edition 1 (3CD), a limited time edition 2 (2CD+1DVD), and standard edition (2CD). Two discs for all editions will have the same content. Though the track lists are unknown at this moment, the songs will be remastered versions of their original sound.
They will also ask the fans to vote for their favorite songs among 134 songs from the group's previous singles, coupling tracks, and albums. The top 15 songs from the votes will be the ones to be included in a third CD for the limited edition 1.
The DVD, which comes with limited edition 2, will contain full-length music videos (tracks unknown) from back then.
KAT-TUN will start their first tour as a 3-member group on April 3, and after the tour, they will go on a temporary hiatus.
Source & Image: Oricon
Thanks to minlilin for the tip!