The game’s director Todd Howard told G4TV that players can turn into vampires if they are infected with a specific contagious disease. There is a treatment for the disease, but if you choose not to go for it, you will permanently become a vampire.
What are the benefits and side-effects? Well, you’ll get a power boost, and will be able to harness your vampiric tendencies. What’s more fun is that you’ll have to actually go around sucking the blood of NPCs to rejuvenate your health. Exciting!
However, it’s not all fun and sadistic as it sounds, as being a vampire means you can’t go out in sunlight, so you’ll have to strictly follow nocturnal habits once you have become a blood-sucking freak.
Alternatively, you could have that disease cured on time (of course, once the full transformation has taken place, there is no turning back) and live a normal dragon-slaying life. Boring!
I guess I’ll have to read a bit of Twilight and re-read Bram Stoker’s Dracula to understand a blood-sucker’s way of life. There are still a couple of months for that, since Skyrim isn’t coming out till November 11th of this year.