What is your prediction for Chapter 58?
My friend has this crazy theory that he wanted me to write for him. He thinks there is some relationship Captain Ackerman has with Mikasa and Levi whom both share his last name. For Levi, I believe he may be the captain's adopted son considering the fact that he did live with him at one point and was involved in the underground activities. However, I'm not convinced of Kenny's connection with Mikasa. My friend believes that she may be his niece and may be related to Mr. Ackerman. Maybe there was some serious strife between them that lead to Mr. Ackerman moving his family to the farmlands of Wall Maria and was concerned that Kenny will become a negative influence on Mikasa. I don't know and need some digging around.
I do believe that Ymir will come back Reiner and Berthold to rescue both Eren and Historia.
Lord Rod Reiss' interest in capturing Eren and Historia.
The Central Military Police's connection to Captain Ackerman's faction.