It's all things that have been mentioned in the review so far, including the mercenaries, the possible moral ambiguity to the magic, and the fact the headmaster is named Cid.
There is one spoiler and that is it pretty heavily implies
Which honestly might not be obvious this early in things, even if it seems so in retrospect.you don't kill Cid.
Well, it's one thing to bring up those topics but that extra step of going "OH BOY I REALLY THOUGHT WE WERE GOING TO TALK ABOUT THOSE THINGS" then states by implication that you do not, in fact, talk about those things. Not exactly a spoiler, like I said, but does inform the shape of the narrative a bit.