didn't think about that actually, but maybe we can see them swim under the ice. And those ice vampires or what they are?
is it the ones at 01:40 in the trailer? http://www.youtube.com/watch?v=nbmBYT8Dwf4
No, I believe that is somthing else entirely.
http://www.uesp.net/wiki/Lore:Vampire#Skyrim
Also it talks about it in my favorite Ob book "Immortal Blood"
The next day, he did return with more questions, these ones very specific. He wanted to know about the vampires of eastern Skyrim. I told him about the most powerful tribe, the Volkihar, paranoid and cruel, whose very breath could freeze their victims' blood in the veins. I explained to him how they lived beneath the ice of remote and haunted lakes, never venturing into the world of men except to feed.
Movarth Piquine listened carefully, and asked more questions into the night, until at last he was ready to leave.
"I will not see you for a few days," he said. "But I will return, and tell you how helpful your information has been."
True to his word, the man returned to my chapel shortly after midnight four days later. There was a fresh scar on his cheek, but he was smiling that grim but satisfied smile of his.
"Your advice helped me very much," he said. "But you should know that the Volkihar have an additional ability you didn't mention. They can reach through the ice of their lakes without breaking it. It was quite a nasty surprise, being grabbed from below without any warning."
"How remarkable," I said with a laugh. "And terrifying. You're lucky you survived."
http://www.uesp.net/wiki/Oblivion:Immortal_Blood
I personally think it would be a poor choice for Bethesda not to put Werewolves and ATLEAST Vampires in. They are so popular.