Hey fellas
i am new here so go easy on me 
some wild self made theories:
-Arima loses unexpectedly to a ghoul that we already know and will be blown away by how strong they really are (i.e. Noro, Tatara, Yomo, Shachi, etc...).
-OR Arima's defeat will come by the hands of a human, not a ghoul. Possibly someone who pulls the strings behind V, or someone who wants to prove their worth to him or something.
-Kanou is a part of V and is using his partnership with Aogiri to accomplish something. There will be stabbing of backs.
-Takizawa vs. Akira
-Haise vs. half-ghoul Amon and it will play out like one of their previous fights.
-Tatara will wreck some souls (FINALLY...hopefully).
Arima is revealed to be dying, explaining the dire need to "replace" him.
Haise leaves mid-manga and the Quinx squad separates: Saiko and Shirazu follow Haise, while Urie and Tooru stay with CCG.
Tooru's character will be drastically changed through a traumatic event (Aogiri captures him?)
Haise joins new Anteiku and finds Amon, Nashiro, and Kurona are part of them.
Seidou visits his mom after nearly being killed.
Haise defeats, then consumes a prominent ghoul in the story
Arata is revealed to be alive.
Rize is on the loose again.
what do you think/
?