This is what they said, "The main villain for The Avengers is none other than Thor's adoptive brother and archenemy Loki (Tom Hiddleston) but needs some serious muscle to go up against "The Avengers" and he does this by using the cosmic cube seen in "Captain America: The First Avenger." Loki uses the cube to get a hold of the Aliens (aka The Skrulls) to invade Earth and fight "The Avengers." Skrulls are green-skinned reptilian humanoids with large pointed ears, red or green eyes, and corrugated chins."
There is also a teaser trailer for the film, coming this summer. It's either gonna be attached to "THOR" or "Captain America". AWESOME!
