I know SMT games can get relatively dark, both in the storyline as well as enemy design, so I wasn't sure if that carried over to SMTxFE or not (I haven't read up on it too much, in fear of getting spoiled). I'm relieved to hear that there's not much to remove, it gives me hope that we'll (hopefully) get everything intact (aside from a few costume alterations).
Like I said, the issue for Treehouse is how to handle the setting and cultural aspects of the game. They've never had to do anything like #FE before, and I'm not sure what the best plan of attack is for them. Honestly, it would have made more sense to get Atlus USA involved on that project, but I imagine they're already tied up with Persona 5 in the hopes of trying to get it out as quickly as possible after the Japanese release, along with Odin Sphere and (probably) SMT4:F