User blog comment:Xilinoc/Ch. 619 - The Betrayer/@comment-26081053-20150312143756/@comment-5398287-20150312155106

Mangastream's scans for one of the chapters included an announcement in Shonen JUMP about a Bleach-related thing called "BLADEs". Given the nature of the name, it seems like it might be a databook, but we're not sure yet.