http://s570.photobucket.com/albums/ss147/Kuromametchi529/Dawnguard/
All the pics I took are there. Some things may be known already, but I took pics anyway. I will update this page with some details on some of them, but please comment as you please. Be sure to check out the cut Vampire Artifacts.
* Ancient Falmer Crown - If nowhere else, it is in the Testing Hall!
* Vampire Amulets
-----* Amulet of Mist Form
-----* Amulet of Supernatural Reflexes
-----* Amulet of The Emplath - Night Power will be Empath (???)
-----* Amulet of Bats - Different from the one you get in-game. It makes your Night Power "Bats". Again, no use. It is the base Power.
* Vampire Rings
-----* Ring of Corpse Curse - Night Power will be Rigor Mortis (I guess this is the actual name of the spell cast with Corpse Curse)
-----* Ring of Reanimate Copse - What is the use? Isn't that the starting spell?
-----* Ring of Vampiric Grip
* Vampire Hood! It is just a recolored Cowl. Just like the Vampire Robes, but it does exist.
* Vampire Lord Armor - Looks like an unenchanted Vampire Lord Armor, but it can be worn with any other armor on top of it and does't show up on your character. I think it is Lord Harkon's Vampire Armor (His Vampire Lord form armor), but II
can't test it.
* Test Bolt (Not pictured) - Just a Steel bolt used for testing.
* Staff of Ruunvald - It may be in Ruunvald, but seeing as I joined only the Volkihar Clan, I am not sure.
* Moth Priest Sandals - YES!
* Moth Priest Robes - YES! - They looked Stretched in the pic, but I had to tilt them up to see the name.
* The Sultry Argonian Bard, V1 - I haven't found it in-game yet, but it may be. Haven't read it, yet, but I will.
* Dwarven Haul - Looks like some bandits found some loot. Haven't found it yet in-game.
* Dawnguard Orders - Saliah - I didn't join the Dawnguard, so they might exist.
* Dawnguard Orders - Lynoit
* Dawnguard Orders - Hakar
* Dawnguard Cache Key
* Confessions of a Kajiit Fur Trader - I haven't found it yet - or read it.
* Ancestor Moth Wing - I haven't found it, but has anyone else? It it in the Glade?
I also took pics of the testing hall rooms and maps. For anyone who has PC, you may know what I am talking about. Originally there was only one hall with Arcane Enchanters, Alchemy Labs, and Blacksmith equipment. Go down further and you find all the chests and an odd table. Just after the table where there was a solid wall is now an opening. Go in and to your right is a wooden door. Open it to find an enormous room with only 2 chests in the middle. Those are the Dawnguard Chests. Interstingly, everything in the game is not there. I did not see the Shellbug Helmet or the new Falmer Staffs, and several other things.