Expecting this to be some kind of Elder Scrolls-style Euro jank in the end. "Historically-accurate" translates to "boring" to me.
I can see that, yeah. However, I can see it also benefit education in terms of learning history in a more in depth way. Obviously besides the fictional aspect of it, to really immerse the player into the emotion and politics of said era/time, it can help to better understand how people lived and what they had to go through during that time under such rulers and such.
Why can't we get some Japan-jank-like game with a European-equivalent to Dynasty Warriors?
Exactly. That's a prime example. Wouldn't anybody rather learn history that way?

I'd be all over dat too.
Until we get VR holodeck reenactments of history, this is a great direction into that field.
Anywho, the trophy list has been shown online. There's one where you can go through the main quest without killing anyone. That shows a good bit of flexibility in terms of gameplay.
Also you can get a trophy for staying a virgin throughout you play through.

Of course, this is all speculation fueled by the current hype on this game... next week can't get here soon enough.