I think there is a falmer shown in the new video bethesda just posted on called animations of skyrim... 10 seconds into the video and more footage is shown later.
Looks like a fishy thing of some sort... And how can everyone be so sure it's a Falmer ? We don't really know how they look exactly it could be anything really.
It is a falmer, here is a pic of one from a loading screen to prove it. http://images4.wikia.nocookie.net/__cb20111108055950/elderscrolls/images/thumb/c/c3/Big_Image00017.jpg/830px-Big_Image00017.jpg
it looked to be a different kind of goblin dressed about the same as the oblivion ones and it had a tattoo so likely a goblin even tho its face is different.
It is a falmer, here is a pic of one from a loading screen to prove it. http://images4.wikia.nocookie.net/__cb20111108055950/elderscrolls/images/thumb/c/c3/Big_Image00017.jpg/830px-Big_Image00017.jpg
I can confirm that there are falmer based on several youtube vids I saw where the person battled against them There are also falmer weapons and such (The 1-h axe is really sick looking)
To survive they were forced to flee underground, mutated through the millenniums and probably even got a visit from one of many Daedric Princes (when you see stuff like that written, you know some Daedric Prince played around)