SE has been pretty good about including Japanese voiceover options in recent years, KH aside (and even that could just be because of Disney, who knows). I'm sure this will have the option, at least as free DLC.
You’re right about the line delivery! It feels like they recorded them specifically for the trailer, the delivery doesn’t feel like it matches any greater context of the scene they’re in.Not to be that dude but what happened to the English dub?! The line direction is Advent Children level or below and so is the delivery at times. I've never had a problem with Square's voice acting until now, but I might have to go subs unless something drastic changes.
Everything else was amazing. The Japanese version of the trailer had me in tears.
Also, what was the thing Aerith was fighting that was in a chariot? New lightning Summon?
Forgot to include outside of combat. Yes other characters take the party leader role but much later in the game though