User blog comment:Xilinoc/Ch. 580 - THE LIGHT/@comment-24942489-20140514212245/@comment-24384892-20140517195622

Yeah, and don't forget Grimmjow and the other Arrancar, along with Kisuke. It's about time for the Hueco Mundo reinforcements to show up.

As for Ukitake, I highly doubt it. He was last seen walking into the forests with two of his subordinates. Apparently, he has decided not to participate in the battle, but who's to say he won't return anytime.