this arc includes many deaths, some new Bankai(Rukia's)(considered to be the most beautiful Bankai ever), Kenpachi and Renji getting to know their sword name, while Kenpachi achieves Shikai (not saying anything else on this), Renji gains immense power. Also to defeat Quincies, Shinigamis eat a hollowfication pill, and gain hollow powers for a while, Toshiro dies and is revived as a Zombie by Kurotsuchi, also the dead walks the land of the living (a Quincy's power) in which Kurotsuchi responded by bringing Hollows killed by Shinigamis to life( from the Aizen arc) After that it was fights that I don't remember. Then Ywach entered the Soul King's palace, with his elites warriors. Everyone was wiped out by ZD but then Ywach sacrificed his low level underlings to bring his squad back to life and then the Zero division was wiped out. Ywach opens his eyes to reveal that he can see the future, and then he stabs Soul king, we see Yorouchi for the first time after 5 years in the manga. Its revealed that Ywach is Soul King's son, not established what kind of son, biological or son as in power using son. As Ichigo is partly a quincy, he is controlled by Ywach to slice Soul King which results in everything falling to pieces.
Now today's chapter revealed Ukitake's past that he was saved by a god, who was Soul King's right hand, so he sacrifices himself to stabilize all the works for the time being. And we see Kyoraku seeking Aizen in the last page.
This arc shows Urahara, one of the most prodigal minding Soul Society, who has everything planned out, being confused. He is afraid for the first time .
Everyone's hoping to see Urahara's past. And of well oh well, when Aizen is released, it will be the most epic thing ever. Aizen never could utilize Hogyuku's full power, thanks to Urahara's seal.
Q. How is Ichigo a Quincy?
A. His mom, Masaki was a quincy
Q. How is Ichigo a hollow
A. Isshin had a fight with Black, one of the first experiments if Hollowfication and was severely injured, which most probably has to do with Ichigo's Inner hollow, as when Ichigo hollowfies completely, he looks exactly like Black, with a different color.
Q. If Masaki was a Quincy, how could she die fighting against Grand Fisher?
A. At the time when Grand Fisher attacked Ichigo, Masaki's power were stolen, as Ywach initiated a cleansing of Impure Quincies, at the exact time. Talk about bad luck eh. Also Ishida and Ichigo were the only impures to survive the cleansing
Q. How could Masaki and Isshin marry? Weren't Shinigamis amd Quincies enemies?
A. Isshin left his shinigami powers for marrying Masaki.
PS - forgot about this, Ichigo's sword was broken to pieces, so the creator of all Zanpakutos makes him a new sword (well as a matter of fact, two). Its revealed that old man inside Ichigo is the Quincy power(Ywach himself) and the Hollow inside him is hos real power.