Filming for Guardians of The Galaxy has already started, but even then nothing concerning the villains has been revealed. The mystery may have been solved today.
Den of Geek claims that they have confirmed with an inside source the roles that several key actors will be playing in the film. First, they say that actor Benicio Del Toro will be playing the role of The Collector, potentially throwing out the Thanos and Rocket Raccoon speculation from the announcement of his casting. In addition, the site claims that Lee Pace will be playing Kree warrior Ronan the Accuser and “Dr. Who” star Karen Gillan will be playing the space pirate Nebula, who also happens to be Thanos’ grand-daughter.
Nothing has been confirmed as of yet, so take this with a grain of salt, though stay tuned for confirmation on the casting as we learn it.