Correct. It affects only the perks. Not the level in the tree. In other words if I had 98 in smithing, and I had 10 perks and I wanted to "clean out that tree", I would spend 1 dragon soul and recover 10 perks, but my smithing would stay at 98. Hope that made sense.

3. Magical drum appears, acting as and AoE buff to friendlies' stamina regen (Magnitude?)

So, we're getting 200 skill points AND a respec. Seems like the Christmas Spirits paid a visit to a certain individual

1. It's the black market and he only carries 2000 gold, regardless of speech perks...it's nice to have a portable merchant but 2000 gold is low, he's daedra but can't even afford a single enchanted daedric item

Book #2 (Name, location?)
1. Combat skills 10% more powerful (Confirmation regarding smithing magnitude?)
2. Spells costs 10% less and enchantments 10% better (Would suggest smithing and alchemy are boosted by #1 and #3)
3. Thief skills 10% better (Confirmation regarding alchemy magnitude?)

If you mean that skills will go past the 100 point max then you're mistaken, you get double points reading skills books until you hit 100 in that skill and skill books no longer boost that skill, same as before

I took the Skill Point too, but it's not what I though, I thought that by point they meant perk, not level. Anyway, it's not very useful if your char has been playing for any length of time and read those skill books. They're NOT re-readable (I've tried). So would work better for lower level chars. ALSO, I'm wondering how this will effect reading the Oghma Infinium AFTER obtaining this power. Double up?

On the Dremora, Butler, all the way, he's awesome.

So its been said the DLC brings 15 new powers split into 5 black books, each one allowing you to pick one of three options. Basically like Nocturnal blessings or Paartunaax meditations. Anyone found any and would like to share?

Compiled data edited in as we go, I'm scouring the dark corners of the internets to fill in the blanks as we speak;

You can have ONE power from each book, total 5 powers, active at any time. They can be swapped, though. This list does not try to present them in a specific order as the info on that is too confusing and innacurate.

From Raven Rock Mine: "THE WINDS OF CHANGE" ... video confirmed
1. "Scholar's insight"; 2 skill points instead of 1 from skill books
2. "Companions' insight"; Attacks spells and shouts do no damage to followers
3. "Lover's insight"; +10% damage to opposite six, 10% better prices from opposite six (need to confirm if stacking with the Speech perk and Agent of Dibella)

Need name/Location Shadow Regent
1. Combat skills 10% more powerful (Confirmation regarding smithing magnitude?)
2. Spells costs 10% less and enchantments 10% better (Would suggest smithing and alchemy are boosted by #1 and #3)
3. Thief skills 10% better (Confirmation regarding alchemy magnitude?)

"UNTOLD LEGENDS" (Benkongerike) ... video confirmed
1."BLACK MARKET" Summon a Dremora to act as a trader (Gold appears a measely 2K, sells ebony and glass items in one video, not affected by perks)
2. "DREMORA BUTLER" Summon a Dremora to carry your excess items (Weight capacity unknown?)
3. "BARDIC KNOWLEDGE" Magical drum appears, acting as and AoE buff to friendlies' stamina regen (Magnitude?)

"Epistolary Acumen" (From Main Story in dumner ruins with telvani guy)
1. Unrelenting force does more damage and has chance to disintegrate target
2. Fire breath spawns fire wyrm from any enemies killed for 60 seconds to help you.
3. Frost breath freezes enemies.

"Unearthed / Filament & Filigree" (Kolbjorn Barrow)
No info yet!
1. Powerattacks cost no Stamina for 30 sec
2. Spells cost no Magicka for 30 sec
3. Take half damage for 30 sec

The Hidden Twilight (Tel Mithryn – Given by Neloth)
No info yet!
1. Summon a field of withering tentacles to harm your foes
2. Freezes target between oblivion and Tamriel for 30 sec, making them immune to all damage
3. Fully restore M/H/S

The Sallow Regent (White Ridge Barrow)
No info yet!
- See above -

"WAKING DREAMS" (After last boss)
perk respec described below, 1 dragon soul to reset a perk tree. Doesnt affect skill level.

There are actually 18 in 6 different books as shown.

Wow thanks so much. That post of yours was highly informative

I have seven black books. I wonder if there are any more to be found. I love finding them and discovering what really cool powers I can get from them.

My curiosity, do these dremora look any different?

where do you get the dremora servant one?

But you can change them at any time.

I'm assuming these are mostly once-per-day powers, too? Such as the no magicka cost for 30 seconds?

Nope. Most of them will show up under Active Effects and are constant.