Jeanne D'Arc seems to be straddling a line somewhere in between all three major styles of RPG: the Fire Emblem style, the Nippon Ichi style and the Tactics Ogre/FFT style. The game is turn-based like Fire Emblem.
In a system that seems combined Nippon Ichi and Fire Emblem, when you attack an enemy, the adjacent square(s) will fire up in sparks and be called a burning site. If a part of your unit is standing there, their attack power will go up, if not, the square will become a burning site and those who step on it will get enhanced attack power. With one attack you can link burning sites from character to character, by having them pass on the burning link in having them in the right places relative to the person who initiates it.
Similarly, if you're standing in special formations close to each other, the defense level of each character in the formation will go up. Level 5 mentions this as a way to avoid those situations where you can barely stand up to an ultra powerful enemy.
As well, there is a system where characters can change into powerful holy beasts and access higher stats/new powers through mystical bracelets. Sounds a bit like the shapeshifters from the newest FE games, since enemies can use them too.
Each character can equip six skill stones, which function just like you'd expect from the name. The purple ones unearth dormant powers in the character, the red ones special command skills, the green ones give magic, and the light blue manipulate stats, additional skills and support effects.
Gamaaru from Rogue Galaxy returns (!) and you can feed him two different skill stones to combine them and create a new one, perhaps unearthing new abilities.
So yeah, as usual for Level 5, Jeanne D'Arc seems to have a lot going for it.