Nice touch to kill off some old, practically unused shinigami, too. Like the dude Ishida and Inoue hanged out with back in SS arc. Guess it means Kubo doesn't have to butcher ALL of his important characters.
As for the thingy at the end... Probably Ichigo. Or possibly the someone orihime who was holding a sword against Urahara. Or isshin. That'd be awesome.
But most likely just Ichigo flying in as if this was against Aizen just to meet despair and see SS falling apart, to then quickly escape with some other captains.
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