How do you become a vampire? Is it just like you get attacked by one with the disease? Or is it within a quest to become one?
You can get it by fighting vampires. Or during the Dark Brotherhood questline you have the oppurtunity to choose to become one.
I prefer contracting accidentally, for role playing purposes.
Also, I don't think they'll be doing vampires in Skyrim. It would be more likely to do werewolves. If you recall in the one book in Oblivion, the only vampires to the frozen north were like water vampires or something that would rise up through the ice. It doesn't seem like they would do that.