Skyrim - Dawnguard Preview, Tidbits
 

Gamefront has a short preview of Dawnguard, quoting Lead Artist Matt Carofano about the length of the DLC:
Meanwhile, The Official Playstation Magazine UK (catchy name) has some tidbits from the beta, including screens and descriptions of both the Vampire and Werewolf perk trees.
More information.

The magazine name is catchy but the content is not original.

It is ripped from the elder scrolls wiki:
http://elderscrolls.wikia.com/wiki/The_Elder_Scrolls_V:_Dawnguard


It still will be good. if I'll have the time :)

Am looking forward to this one but i have to say i am rather dissapointed with the werewolf tree. It has about half the skill the vampires get and they dont seem to affect the playstyle much if at all.
Seems kinda tacked on at the last minute but i am sure some enterprising modder will remedy that.
Also they estimate the length of it to be about the same as a guild quest wich seems rather short. Dont recall any of the guild quests taking more then half a day or so to complete.

It think he meant the whole quest line, not just one quest.

Did the companion quest line a few days ago and dont think it took more then 8 hours start to finish.

It certainly took me longer than that, but I can see how you could do it quicker if you wanted to rush.