Okay so, to continue discussions while we wait for more spoilers and pictures and leaks to come through...
with Thor 2 we are expecting to see all the 9 realms involved. (or at least creatures representing them all) . I am not sure if it was confirmed for sure all 9 though I know it has been rumored all along. So...
Realms we definitely have represented in Thor 2: Asgard, Midgard, Svartalfheim (Dark Elves)
Realms probably represented in Thor 2 (according to our guesses about plot here): Niffleheim (Hel), Muspelheim (Fire Giants and Demons)
Assuming we do see most of the realms, if not quite all, out of the ones we have left, which do you think will also make it in, and why? What impact might they have on the story?
Alfheim (Light Elves)
Jotunheim (Frost Giants)
This is a nice website with reference to the mythology, with the page on the realms here: http://www.viking-mythology.com/theNineWorlds.html
and another site to reference with pictures of Marvel's version of the 9 realms: http://marvel.wikia.com/Category:Nine_Worlds