Legendary Dragon Picture http://i.imgur.com/18jft.jpg The name of the dragon in the Soul Cairn was Durnehviir.
There are new enemies called Keepers
There are new enemies called Bonemen. [skeleton's with helmet's]
There are new enemies called Wraithmen
The daughter of Lord Harkon's Name is Serana
Dawnguard will be 10 to 20 hours long
Dawnguard will hopefully release on June 26th for Xbox 360 with a month exclusivity if all goes well beta testing and bug finding. Ps3 and PC will get the DLC though
According to Todd Howard mods may be soon coming to consoles if "something clear's up" He also said "In a perfect world that would all be possible, but it's something that hasn't worked out yet."

Vampire Lords can summon Gargoyle's
Vampire Lords can attack with their claws
Vampire Lords can hover
Vampire lord Perk tree: 11 Perks

Power of the grave - 50 bonus to M/H/S
Blood Healing - Killing a person with a power attack bite restores all of your health
Unearthly Will - Night Powers and Blood Magic costs 33% less
Poison Talons
Night Cloak
Vampiric Grip
Summon Gargoyle
Corpse Curse
Detect All Creatures
Mist Form
Supernatural Reflexes

There will be some Werewolf content but they aren't telling us anything as of yet
According to Todd "We can customize our base" More info is needed as to what this means an exact quote would help
The Purple Flaming horse was seen near a Giant fire which is only at Giant camps, so we can use the Purple Flame horse outside of the Soul Cairn
Todd Howard says that the Dawnguard get's Armored Troll pets
Most of the Werewolf Perk Tree http://imgur.com/a/5iBUK
Here's the left side of the Werewolf Perk Tree
Totem of the Predator
Savage Feeding
Totem of (Ice?) Brothers
Can barely make out the far left perk, but it looks like "Totem of the Moon"

Screenshots i took, entrance to the Soul Cairn http://i.imgur.com/tOdcV.jpg Dead Legendary Dragon http://i.imgur.com/FCNU8.jpg

Gameinformer Hands on preview. http://www.gameinformer.com/games/the_elder_scrolls_v_skyrim_-_dawnguard/b/xbox360/archive/2012/06/05/hands-on-with-the-elder-scrolls-v-skyrim-dawnguard.aspx Looks like we go on a quest to get Auriel's Bow

Thank you Senor CInco for the Vampire Lord Perk tree, Thank you Xenonychus for the Dragon's name. Thank you Korbu for the rest of the Werewolf Perk Tree

Did i miss anything?

Sounds good, Serana better be a marriage option

I believe you may be able to furnish the strongholds or upgrade them in some way.

There was a monster wielding a Dragonbone Axe and an armor, Well that is NEW!

I think I may have just [censored] a brick. Is this true?

I missed the live stream. Can't wait till a video is posted because I really want to see the new game play.

Yeah he said custom fort or something along those lines.

MODS!? FOR CONSOLES!? Oh [Censored] the hell yes!

Forgot. Added.

Hm, for some reason, the video isn't loading. So thanks for this

That was the Keeper.
Yes. He said we may get mods if they can clear something up.

You missed the fact that Vampire Lords can grab and toss people.

Boo! More Akaviri stuff.

I want Serena's Outfit!

It looked like one of the Dawnguard was carrying a new type of hammer as well.

I didn't see this.....

The fact that they can grab people with Telekinesis has been known.
What?

The skeletons looked awful!

I don't think Todd expects mods to come to consoles. There isn't some tiny issue to solve here.

They showed nearly half of the vampire perks, Can these be added to the OP?

I need it!

And that likely means getting through to Microsoft and Sony, which I very highly doubt will happen anytime soon, they'd want monetary compensation.
That "something" is a really big something, and there are likely more problems.

Don't get your hopes up.

If the got mods for consoles I would name my first-born child Bethesda Softworks

Amazing...

Wait they're bringing mods to Xbox?! Or is it just speculating?