User blog comment:Xilinoc/Ch. 587 - The Headless Star 6 (for real this time)/@comment-2211792-20140703125145/@comment-11051098-20140705114559

Kubo said he will reveal every Bankai in this arc, and as the arc is still far from over, there's no saying he won't do it. Besides, what does he have to gain on promising this and that and then breaking it?