The following list contains the list of creatures confirmed in the game:

Alpha Wolf
Bull Netch
Centurion Spider
Clannfear
Daedroth
Dremora
Dreugh
Duneripper
Durzog
Dwarven Centurion

Dwarven Sphere
Ember Mage
Flame Atronach
Flesh Atronach
Foot Soldier
Frost Atronach
Frost Mage
Giant Scorpion
Giants
Guar
Hagraven
Harpy
Kagouti
Mammoth
Maomer

Mud Crab
Necromancer

Netch
Nix-Hound
Ogrim
Scamps
Skeletons
Spider Daedra
Vampires
Wamasus
Werewolves
Wisp Mother
Wolves

So what creature from one or more of the previous TES titles would you like to see in ESO ?

For obvious reasons, one of the creature I would like to be back in ESO would be the Daedra Seducers (from TESII:Daggerfall):

Should add Maomer on that list, they have been confirmed to be in the game also.

Done. Thanks.

But you did not answer the question

But...I don't want too.

I'd like to see everything from every ES series, as long as it makes sense though, of course.

The more the better.

Ok. That's an answer by itself ^^

Me too of course, but is there not a favorite creature you would be missing if it did not make it?

PS: Maybe not for Cliff Racers >_<

Probably the Centaur, or even a Minotaur. (Ogre's are sweet, too)

Dwemer Centurion has been seen in some scenes. The big one.

rats! what would the elder scrolls be without a bunch of rats here and there?

however, I'd love to see something I haven't seen in any other TES game.
unseen creatures that hide deep in the woods of Valenwood or in the swamps of of Black Marsh.

Oh yeah a Centaur would be cool. Even more if we can get one as mount

Do you mean like this one: http://images.uesp.net/0/09/SR-creature-Dwarven_Centurion.jpg ?

Rats or Skeevers ? ^^

Hmm an unseen creature in the swamp of Black Marsh... What about a mudcrab with high sneak skill ? xD

Jup, that one.

Also, Netch. I haven't seen Nix Hounds yet, though, any source for that?

Rats,
you find them it caves, you find them in sewers, you find them in granaries, and the first quest of the fighters guild has to involve rats!

I have added Netch and the Centurion to the list.

for Nix Hounds check http://www.youtube.com/watch?v=hO3kO2uPoxY at 1:26