User blog comment:Xilinoc/Ch. 542 - THE BLADE IS ME/@comment-10630156-20130620021814

interesting to see Yhwach at the end and of the chapter. I am wondering what it is about. But I do have a theory why the Stern Ritter are all present (as well as what seems to be the majority of the quincys army)

I think the Vandenreich will make another attack soon so that their enemies can't unite (Grimmjow and the espada/faccion joining forces with the Gotei 13 again the Vandenreich). Grimmjow is most likely with Urahara and the other faccion are probably with him quite, a powerful force, and I'd be incredibly surprised if Yhwach doesn't move to attack them. It would not be surprising if this information was given to Yhwach by Uryu and that Uryu fights in this new battle