I just installed Dawnguard, fired up a new game, and quickly learned that Dawnguard now cleary reveals vampires.
http://www.uesp.net/wiki/File:SR-npc-Hert.jpg...
... http://www.uesp.net/wiki/File:SR-npc-Hert_02.jpg.
I believe Dawnguard just changed the eye and face textures for every XXXVampireRace, correct? I'm sure there is something out there that reverts the textures back to vanilla.
Many thanks in advance!