So far, Skyrim has about 20 confirmed creatures (Draughr, Skeletons, Trolls, Giants, Ice Wraiths, Giant Spiders, Dragons, Wolves, Horses, Elk, Mammoths, Saber-Toothed Tigers, Centurion Spheres, Dogs, Skeevers, Bears, Rabbits, Horkers, Dragon Priests and Ice Atronachs).
Dont forget horkers! But, I do expect more creatures than in Oblivion. Watching the Gameinformer vid about Skyrim Art, I saw an illustration of what apeared like a Spriggan or Dryad. I'm hoping for creatures that come mostly out of Norse Mythology, maybe some Slavic, and of course, the ES twist on their design. I'm very happy they are making the creatures more involved in their world, having places to live, things to hunt, etc.