User blog comment:Xilinoc/Ch. 541 - THE BLADE AND ME 2/@comment-5551986-20130612141738

We haven't seen the new sword, but it bears resemblance to a larger "Engetsu", whether it was blue reishi flames that "Yhwach" was using to suppress it, i don't know. But New Zangetsu has some 'splaining to do, why he was so hostile throughout the entire time he was with Ichigo.

Only one loose end remains, and thats how to edit the wiki. If we reveal Zangetsu and Hollow Ichigo, to people, it will spoil it if they only watch the anime.