I'm just guessing which chapters will season 2 covers. Chapter 71 is latest but if they will go for 25 episodes, I think Ch71 is as Ep15-17. I hope that it will end on the chapter when Eren arrives Shiganshina, the battle against the Beast Titan, and the revelation of the basement (if only they continue to the real thing, not more flashbacks). I dunno what else since AoT is a lot big, I think of Season 3, two movies covers season 2, and a sequel to its 3ds game. :3