I knew there was something missing in Skyrim. Dwarfs !!!!
There are Dwarves in Skyrim, but they're Elves. Go figure. The various deep holds you visit filled with mechanical nasties are remnants of the Dwarves -- called the Dwemer. So, not missing from Skyrim, just present in a different variety, and never really seen.
Me? Pedantic much? Yup.
Edit: Also, I could not be more excited for this movie if I tried.