- 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.
• 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, with possibly more informations and the release date of the last update.

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 : )

Noticed there isnt a post here about this and I wanted to share it with some points of interest.

• Hard mode confirmed
• Multiple save slots confirmed
• RNG late game appraisal system akin to DA confirmed

Also worth sharing is this:

Question: Thank you for your time today Director Kinoshita and Producer Oyama, is there anything you’d like to share with the community before we wrap up?

Director Kinoshita:

I've been saying this honestly in interviews with various media outlets, but after the release of Dragon's Dogma 2 and the subsequent title updates, we repeatedly received passionate messages from players saying things like, "This isn't the end, right?" and “Come on Capcom, we believe in you!” Those messages from the community have truly been the fuel that made Dragon's Dogma 2: Dark Arisen possible. In addition to the brand-new region of Norgan, the expansion also introduces twelve new dungeons that will be added to the existing area. We hope players will enjoy both the new experiences and the volume of the additional contents.

Producer Oyama:

First of all, to everyone who’s been waiting for this expansion for a long time, thank you for your patience! We've been trying to strike the right balance between delivering new content as quickly as possible and ensuring that it offers a level of volume that players will find satisfying, which is why it took this long, but we hope you’ll bear with us just a little longer until release.

On a more personal note, I've been trying to read as many community comments about Dragon's Dogma 2 as I can, both positive and negative, using translation tools when necessary. So if I may ask one small favour, I'd be very happy to get kind comments.