So the Spirit King isn't Don Kanonji. I am disappoint, Kubo.
So, Urahara's been to the Reiokyu at least once to study the magical hot springs of healing. I'll admit, the way Osho treated Byakuya, Renji, and Rukia was hilarious. I'm surprised that Kenpachi wasn't bobbing around in there somewhere.
The nature of the Oken is finally explained, and it's pretty cool that it's their bones and not just some boring old key. Also, the Quincy are apparently beyond evil according to Senshumaru. Kubo seems to be trying to prove that Aizen is nothing compared to these guys, and I'm starting to believe him.