Paladin

The most major thing is that Paladins will get a new combo chain that branches off from Savage Blade. Up till now, Paladins only had their enmity combo, which had them continuously generating enmity even when it wasn't necessary.

Warrior

Warriors will be recieving a new battle "stance" called Deliverance, which serves as a damage dealing stance. It'll in a similar manner to their tanking stance, Defiance, in that using certain skills will generate stacks of an effect that can be spent to unleash special moves. The "stack" will be converted to the opposing version whenever you switch stances, which will help if there's a sudden need to become the main tank, or vice versa.

Monk

Monks will gain an extra set of 'stacks' known as Meditation, and a new set of actions will be introduced that drains a monk of their Greased Lightning effect to deal increased damage. As Greased Lightning also serves to increase a monk's attack speed and damage output, some thought will be needed to determine when it'd be appropriate to unleash these attacks.

Bard

Bards get a new tune to play in Wonderous Minuet. This skill only affects the caster and allows them to power up their attacks by charging them. However, any movement at all will cancel charges, so it's not recommended when a lot of moving about is in demand. The ability to auto-attack is also disabled while the Minuet is in effect, so the ability "Barrage" should not be used while Minuet is in effect under any circumstances. Other songs, which serve to support other party members, can be used simultaneously alongside Minuet, as Minuet does not affect the Bard's MP.

Summoner

The "Tri-Disaster" spell will be renamed to "Tri-Bind" while a new version of "Tri-Disaster" will be added which instantly casts Bio, Bio II and Miasma at the same time. Summoners will also recieve a state called "Trance of the Dreadwyrm" which can be used to cast a high damage attack on the target (this attack is essentially Bahamut's Akh Morn attack from his battle within the Binding Coil). I honestly am not entirely certain how this works, but I believe it's linked to Aetherflow in some way.

Dragoon

I have absolutely no idea what any of the new actions do I kinda forgot. Whoops.

Black Mage

Four new spells: A wide area mark is placed on the ground and as long as the caser remains within, they recieve a haste effect, reducing the time it takes to cast spells. Stepping out of the circle at any point, for any reason, will cause it to instantly vanish, regardless of how much time is remaining. Second is "Sharpcast", which is more of an ability, actually, but it guarantees that the next spell cast will have its bonus effect activate. This is primarily intended for casting alongside Fire, for a guaranteed free cast of Fire III. After that is Fire IV and Blizzard IV which I don't quite understand. All I know is that they don't actually "refresh" the effect of Astral Fire or Umbral Ice.

White Mage

White Mages also recieve a buncha stuff. They get a sort of light dome thing, though I don't actually know what it does. They also get newer versions of their Stone and Aero spells, Stone III and Aero III. Aero III appears to be an area of effect spell, which applies an Aero effect to all enemies within range. Stone III, on the other hand, I'm not sure if it has any bonus effects besides just being a stronger version of Stone II.

Scholar

Scholars seem to gain a spell or two that can only be used while their partner faerie is summoned, as it causes the creature to vanish. That's about all I know.

NO, NOT NANAMO! ANYONE BUT HER! D':