Shush! Do not question perfect vampire logic.
This.
And for the Werewolf lovers... we Vampires
told you that the night belongs to us.

The vampires are probably servants of Molag Bal, the Lord of Domination, based on the seal on the Lord's armor.
Also, the first thing i thought of when they said that the tyranny of the sun will end is that vampires will no longer feel its power and be able to go out in the sun.
This.
I think that this strain (my theory is that their the original strain of vamps created by Molag Bal...) is going to use an Elder Scroll and some kind of forbidden magic to erase the weaknesses that the sun holds for them. To be able to walk around with full powers and capabilities regardless of the time of day.
But I'm most excited that my Dunmer Vampire won't have to rely on sleeping people to feed.
