Adding a nice write-up from reddit that summarises the ability stuff they talked about:
•New stance called "Deliverance", increases damage and has its own stacks called "Abandon". Deliverance and Defiance can be switched and the remaining stacks will change to those of the according stance i.e. Wrath and Abandon will be retained and swapped while switching stances.
•A new AOE that looks like an Earthquake.
•The new buff shown on the HW trailer named "Raw Intuition". Guaranteed a Parry while being attacked in front, but guaranteed a crit damage if attacked from other angles.
•A crystal "taunting" move.
•New song "Wanderer's Minuet", affects self only. While singing this song BRD can't move while attacking, can't Auto-attack but can fire charged shot and increase damage deal.
•Wanderer's Minuet will not consume MP and acts like a stance. Moving will instantly end it.
•New attack called "Sidewinder". Increases effect of already applied DoTs.
•Doesn't get a new stance. Huton will be longer. Will have more positionals.
•New Enmity Manipulation skill.
•Tri-disaster renamed to Tri-bind. SMN will have a brand new Tri-disater spell which is expected to apply Bio II, Miasma, and Bio all at once.
•No new pets, but existing pets will have more actions.
•New skill "Bahamut Trance": Infuses the power of Bahamut to the caster, certain actions will yield "Bahamut Stacks" which can be spent for Akh Morn some high potency attacks.
•A new AOE Regen called "Asylum".
•Stone 3, Aero 3.
•Some new instant less-powerful-than-Benediction heals.
•A new stack called Chakra that can be stacked up to 5, and can be consumed to deliver a high potency attack and restore TP.
•A way to switch stances without attacking.
•High potency attacks that consume Greased Lightning.
•2 stances: Moon Reading and Star Reading. One is WHM-like and one is SCH-like.
•Cards drawn are random. You can use a drawn card immediately, or put that on hold and draw a second card and add the effect of the first card on top, or discard it to draw a new card.
•There will be 6 cards: a Haste card, an Attack Power card, a Vulnerability Down card, an Omni-cast card and 2 more cards.
•Manually reload (likely to be on GCD), has casting time and can reload up to 5 bullets.
•A instant oGCD "Quick Reload" which instantly reloads 1 bullets.
•A new buff called "Blood of the Dragon" that triggers some 4-stage combo after Full/Chaos Thrust.
•A high potency attack that consumes Blood of the Dragon.
•Jump animations will be adjusted.
•Will use MRD and GLA cross-class skills.
•Has a gap closer and a ranged attack (shooting black laser from the sword)
•A Grit Stance for tanking and a Dark Stance for DPS. Dark Stance consumes MP and unaffected by Ballad. Grit Stance will buff Accuracy. They might have recommended that DRK should stance-dancing more often by building hate on Grit and switch to Dark and so on.
•New skill called "Dissipation" that "consumes" Fairy to increase magic potency.
•A skill called "Deployment Tactics", that enhances Adlo and make E4E AOE-ish.
•A skill called "Emergency Tactics", that affects Adlo and makes it instant heal instead of the shielding effect.
•A skill called "Indomitability", enhances healing potency.
•Fire 4 and Blizzard 4.
•Enochian: 30 sec buff that allows caster to cast Fire 4 and Blizzard 4.
•Ley Lines: Ground AoE spell speed buff . Only works on the caster.
•Sharp Cast: Forces the next spell to proc.
•A finisher combo from Riot Blade.
•A finisher combo that inflicts DOT.
•A new blocking attack.
•New action: Divine Veil: Sets a protective barrier around the target where if the target receive cures while under the effect, other nearby members will also receive a barrier effect.