I don't know anything about them, but just by looking at them they certainly look more civilized than the Frost Giants. Maybe not Asgard level technology, but they don't appear to be the unruly brutes that the Frost Giants were, either.
Correct me if I'm wrong, but in Thor wasn't is established that, at one point, the Frost Giants did have a decent civilization going? I mean, they had a pretty smart King, and Jounheim had at least the remnants of a city remaining during the modern-day parts of the film. It was with the loss of the war with the Asgardians (and, more importantly, the loss of the Casket of Ancient Winters) that their society really began to fall apart.
EDIT: After searching online a bit, it seems that Malekith has some close ties to the Casket of Ancient Winters. I wonder if we may be seeing that again? Also, if we see Odin's treasure room again, I would love to see the Tesseract in there as well, since Thor took it back with him.