I expect the Zero Division to make an appearance, probably a minor one. At least Hyousube Ichibei (the monk) was recuperating last I remember.
And the usual layers upon layers of ability "tiers" and power-ups. Convenient ones, of course. It was cool the first time, but by now Kubo is about to surpass JoJo's Araki in this field (not a good thing).
The funniest moment about this arc though is the Kenpachi thing:
"We're in deep ***. We just lost the Captain Commander. WHAT DO?
..AHA! Let's have our strongest 2 BATTLE TO DEATH...because tradition (did I miss something?). Soul Society only needs one Sna...I mean Kenpachi".
And the miracle Quincy dude receiving the Yammy (Arrancar numero cero) treatment LOL. Ain't got no time for you buddy, we've got an arc to wrap up!
Seriously though, how come nobody, throughout the series, recognized Ichigo's Quincy reiatsu (excluding his father and All-Knowing Urahara)? Ishida is supposed to be smart and perceptive.
And how could Ichigo carry out normal shinigami duties at the start of the series and send souls to soul society if his powers were suppressed?
That being said, I don't think that Kubo ret-cons events to serve future plots, despite most of them being seemingly convoluted.
What about a shikai that uses water to hypnotize others to see illusions?
Unless it was stated and I missed it, I don't think Aizen's shikai utilizes water. It controls the 5 senses, not just vision.