To be honest I didn't really get a Persona vibe from the trailer. And I like that Aversa and Gangrel appeared as foes, so FE villains could be used as bosses or monsters.
Note that is really applies more to mainline games than spinoff franchises, where Law and Chaos are allowed to be more flexible. Even Devil Survivor 2 routes were based on Astrological Star Signs rather than alignments, like the rest of that game concerning the invaders and the like.
It's possible for one to go down a chaos route and end up fighting a Chaos representative because you don't have to agree with them.