In some information source about Dawnguard I have read that there would be two side quests that are not connected to the main quest, that people would really love.
I don't know why, but I have got a feeling (That tonight's gonna be our good night lol) that these side quests are actually some kind of Dawnguard VS Vampire arena...

What do you think theses side quests would be?

I doubt it. Because I've thought about it from every angle and it just doesn't make sense. If you can explain to me how, logically, that would work...?

Well maybe there is a dungeon which is a passage way to a strategic point for both of the factions, and the two of them fight over it always, so you would have to get in there and fight some vampires/dawnguard, and they just keep coming!

Sounds interesting but unlikely.

No chance
Unfortunately

yeah no chance.