Today the JP Twitter gave us the first look at the game's class system, and there's a lot to glean from it. This post contains both confirmed information and my own speculation based on what we know.
We specifically see menus for Framme, Vander, and Louis, i'm putting the pictures here instead of linking them every time I talk about them.
To start with what they've already told us, promotion is done at level 10 or higher with a Master Seal and reclassing into a different class of the same rank or lower is done with a second seal like in awakening and Fates. Any unit can theoretically become any cla