I know this may be a silly question by now, but I haven't had time to check the formun or the net in search for the content of this new DLC, and I would like to know if is already known what it will contain, or at least what will be the main plot or anything about it, thanx for any info you can share =)

The Volkihar vampires want to blot out the sun using Elder Scrolls and the Dawnguard have to stop them. You can choose either side.

It Contains

-Crossbows
-Volkihar Vampires
-new armour
-The Soul Cairn (a realm of oblivion for souls of vampires I think)
-A new summonable purple flame horse
-Vampire lord transformation
-new neck bite animation
spells for the vampire lord
-werewolf perk tree
-vampire lord perk tree
-you can craft higher level crossbows
- Dragonbone weapons
- new dragon shouts

You should watch the trailer, it will explain a lot.

woah, thanx thats sounds really cool, so that means its werewolfs vs vampires or the werewolf transofrmation is optional? thanx for the info now Im impatient for playing it

A vampire lord named Harkon trieds to "stop the tyrany of the sun" and vampire hunters try to stop him.
Also contains alot of non-vampire realated stuff and quests.
It should be noted you can choose to be dawnguard(vamp hunters) or vamp lords. Two main quests basicly.

Ooh I never knew about the purple horse!

Quick question though, there's more perk trees, are there more perks?

Dawnguard is Vampires vs Vampire Hunters. Bethesda just wanted to give the werewolf a perk tree since they were lacking..

the only new perks are for vamps and werewolves. you level them up by feeding and mauling.

This is most... interesting. Thanks a lot.

New perk trees for vampire lord and werewolf but you dont spend points in them. They are leveled up by feeding or mauling people.
And you may get perk points for feeding and you can choose what you want----->*my speculation*

No problem. Hope you enjoyed the info

For most info on alot of games, go to IGN.com

I didn't know any of these sounds awesome, thanx for the info, you know other thing I wish they could add sometime are more light armours, as the ones that are not elfic are boring to my taste

Well from the trailer and the interview vids, it seems like they added quite a few new armors. I've seen a checkered leathery looking light armor and a sleeveless version of it. I think the armor and weapons that the armored horseman in the trailer uses are mithril.

Ha. No. IGN is wrong more often than they are right. They give biased game reviews and very often have no idea what they are talking about. As the popular internet saying goes, "You can't spell ignorant without IGN."