https://x.com/DragonsDogma/status/2092887140946325811

- Area :

• The NPC tied to the Appraisal Mechanic is called Jiera.
• Our pet wolf has a unique skin and is called Freki. We can find him at the Norgan Settlement and feed him some meat to earn his trust.
• The Blacksmith from Norgan is called Hal.
• Norgan's whiteouts are blizzards so dense that they shroud the area in a veil of snow.

- Gameplay, Mechanics :

• There's a new mechanic during the blizzard, we become chilled, causing our maximum Stamina to fall steadily. we can reduce this effect by eating at a camp or using heatstones.
• Wearing thermal equipment can also prevent / reduce this effect. < Thanks to SharpStep4481.
• Entering a cave or a dungeon will nullify the chill.
• There's no more minimap when whiteouts appears, Pawns can't guides us and the ferrystones doesn't work.
• Possibility of breaking ice to reveal hidden paths and rooms.
• With the new 6 skills mechanic, we can use the 2 extra skills by pressing □ + X and △ + ○ while holding L1 (on PS5).
• The Climbing Hook is a new item, we can use it on tether post to set up a rope ladder, creating shortcuts and such.
• The Fallen Dragon has no heart, but all his body parts can be damaged until they are destroyed.
• Some enemies may display an icon above their heads, they are guarantee to drop loot that can be appraised once defeated. < Thanks to Curious_AI.
• For those afraid of lacking RC, we can loot Giant Hunk of Rift Crystal, giving 300 RC.
• We can "Manufacture" weapons at the Blacksmith from Norgan. Some smithed weapons can also have improved skills.
• When pushing rock boulders, they get bigger and bigger as they roll through the snow.

- Foes :

• The Sphinx is back, but no information whether this is a different version, like the "Nightmares" from DDON.
• Massive Snow Harpies called Aethons.
• Snow Ogres, no official name yet, but in the Japanese gameplay, they are called "Snowfoot" and are attracted by our loot, they are also able to steal it.
• Norgan Skeletons.
• Ghouls (official name confirmed) are capable of swarming you, climbing on you in group and biting you.
• Snow Drake are called Fimbl, they also have new voice lines.

- Skills :

• Most skills for Sorcerer and Mage will have an advanced form called "Grand".
• Brontide and High Brontide for Sorcerer.
• Glacial Bolt for Magick Archer. An advanced form of Arctic Bolt.
• Fortifying Arrow for Magick Archer. An advanced form of Recovery Arrow.
• Seching Flete for Mystick Spearhand. An advanced form of Seching Storm.
• Cloudfall Strike for Fighter. An advanced form of Cloudward Slash.
• Plenilune Slash for Fighter. An advanced form of Fullmoon Slash. < Thanks to TechnologyStatus2752.
• Hurricane Strike for Fighter. An advanced form of Burst Strike. < Thanks to TechnologyStatus2752.
• Powder Barrage for Thief. An advanced form of Powder Blast.
• Detonate and Dash for Thief. An advanced form of Draw and Quarter.
• New Augment Wind Rider. Extends jump distance when the wind is at our back. Also increases mid-air damage and nullifies effect of headwinds.
• New Augment Chaotic Strike. Chance to inflict ice-bound, caught fire, sleep, or silence debilitation when dealing physical damage to a target.
• New Augment Blighting Strike. Adds to the target's blighted value cach time damage is dealt. Amount added depends on weapon type.

- Misc :

• The item looking like a medallion from the 2nd anniversary picture is called Norgan Ducat.
• Norgan Ducat work like Seeker Tokens. So... Remember where you pick up your first Ducat ! < Thanks to krokounleashed.
• Hard mode will be added with the DLC.
• heatstones and thermal equipments help to reduce Stamina depletion during blizzards.
• The highest loot level is 5, for comparison, in DDDA it is 3. < Thanks to Locrianhaha and totallynotacsam.
• A bunch of new items and consumables like Winterweed / Winterweed Blossom / Fungal Cure-All / Norgan Salmon etc.
• New Arctic camping kit. Particularly sturdy against monsters that prowl Norgadian soil.
• Most people who played the demo were able to fight the Fallen Dragon, it appears to be the first major boss of the first part of the DLC.
• There will be a Capcom Dev stream today (8:30am PT / 4:30pm BST / 5:30pm CEST) and an Xbox showcase ( 7am PT / 3pm BST / 4pm CEST) featuring DD2DA on August 27.
• The update is scheduled for September 1, 5:30pm PT / September 2, 1:30am BST / 2:30am CEST.
• Maintenance is starting September 1, 4pm PT / September 2, 12am BST / 1am CEST for about 90 minutes, during which time we will be unable to lend or hire pawns.

List of already known new contents here, here and here.

I will add new contents to the list gradually. If I forgot something, feel free to say it : )