The Squad Zero emblem has apparently been revealed aswell:



Here's the full overview of the 3 specials though with some things I've missed out:

Gotei – 13

First Squad & Yamamoto Genryuusai Shigekuni:

* He only has his right arm now.
* He has some inner, unseen changes.

Second Squad & Soi Fon

* Soi Fon’s arm has been healed.
* Her hair changed a little.

Third Squad

* Rose is now the captain of third squad.
* Kira is still vice-captain of third squad.
* Kira's Bankai "feels a bit gross/disgusting"

Fourth Squad

* Unohana Retsu will fight.
* Her zanpakuto’s true form will be revealed.
* She will unravel her braid when she fight.

Fifth Squad

* Shinji is now the captain of fifth squad.
* Hinamori is still vice captain of fifth squad.
* There will be a mutual relationship between Shinji and Hinamori.

Sixth Squad

* Renji became more wild.
* Byakuya became prissier.
* Renji’s bankai changed.

Seventh Squad

* Komamura’s clothing has changed.

Eighth Squad

* Kyouraku will release his bankai in the upcoming fight.
* His flowered haori has a story.

Ninth Squad

* Kensei is now the captain of ninth squad.
* Hisagi is still the vice-captain of ninth squad.

Tenth Squad

* Hitsugaya perfected his bankai.
* There's a chain now attached to his Bankai's sword.
* Rangiku's past will be significant to when Hitsugaya started as a Shinigami

Eleventh Squad

* Kenpachi’s story of becoming captain will probably be told.
* Yumichika's strength rivals Ikkaku's - "Kubo has an idea for his Bankai"
* Ikkaku wears an armour equipment on his shoulder with the word dragon on it
* Possible Yachiru battle scene

Twelfth Squad

* Mayuri has a new appearance.
* Mayuri's research of the bodies will be his main role in the new arc

Thirteenth Squad

* Ukitake is still sick but will recover.
* Rukia is now the vice-captain of thirteenth squad.

Hueco Mundo & Arrancars

The below ones are all according to what Kubo said:

* The arrancars may show up again.
* They will show up as a group if they come back.
* Grimmjow might be a nakama.
* Nel probably will appear again as well.

Extra Informations

* The Lost Agent Chapter was based on Sado.
* The new battleground is underneath somewhere, unexpectedly close.
* Kubo said he wanted to draw a “Palace of Ice.”
* Many mysteries will be revealed during the final arc.
* The meaning of true blood, which Arrancars talked about.
* The relationship between Isshin and Ryuuken
* The psychical resemblance between Ichigo and Kaien
* Spirit King
* Squad Zero
* The relationship between Urahara and Yoruichi
* Hiyori’s fate
* The truth behind Masaki’s death
* Aizen will (probably) return
* Ichigo's birth

- The new territory that this arc takes place in is "unexpected" and "dangerously close".the "new territory" is accessed through going underground from "surprisingly close" place and the whole new territory is covered in ice, with a frozen waterfall at the end of it with the ice palace standing on top of the waterfall:

- surviving Arrancars like Grimjow, Nel, Halibel will most likely re-enter battlefield to fight on Ichigo's side.
- Unohana will fight. When she releases her bankai she unbraids her hair too.
- History of Shunsui will be revealed. The history of him has to do with the pink cheap woman's haori shunsui keeps wearing. Kubo implied it has a "huge history" tied to Shunsui.
- Connections between Ukitake, Shunsui, Ryuken and Isshin will be revealed as well as the puzzle pieces about Ichigo's birth, Aizen's role in it all and etc.
- It will be explained on whom did Ichigo reminded Ginjou of and whom did Ichigo reminded Ukitake of.
-What mayuri found in HM plays a huge importance and will be revealed.
- Byakuya became more "relaxed" while Renji became more strict. Renji's bankai improved and completely changed form.
- We will learn how Kenpachi became captain as well as about his sword.
- Say hello to new Mayuri:

- The meaning behind arrancar remarks about true blood will be explained.(Namely Grand Fisher commented on Ichigo being of "true blood")
- The misteries and reasons behind Kurosaki Masaki's death will be revealed as well as her past.
- Next antagonists (royal guards being quincies?)

- Aizen will be back at some point.
- Urahara will be explained as well as his true allegiance and "shady goals".
- Explanation on Ryuuken, the promise he made Uryuu swear, goals, etc.
-THERE'S ACTUALLY A REASON WHY KAIEN AND ICHIGO Look alike