A better look at Christopher Eccleston's villain in "Thor: The Dark World" emerged today. Both a new bit of banner art, and a video clip focused on the character, have gone online.
In the comics and film, the character of Malekith the Accursed is the ruler of the Dark Elves of Svartalfheim. The forces of Asgard must confront this dark army following the destruction of the Bifrost at the end of the first "Thor".
The clip is likely from early in the film as the banner above, and other stills, have showcased the character sporting a heavily scarred visage: