Let me be super-clear. Karen Gillan, the human being, has NOT been cast by J.J. Abrams in Star Wars: Episode VII. However, the hair that was formally attached to Karen Gillan, the human being, will be seen in the film. Perhaps as a love interest for Chewbacca?

The Oculus and Doctor Who actress shaved her head for Guardians of the Galaxy and the guys at Marvel couldn't stand to see all that beautiful hair go to waste. Gillan tells Collider:

Was it just very liberating to shave your head, or did you have any moments of tears while they were doing it?

GILLAN: No, I was laughing hysterically. It really hit me when I woke up the next morning. That's when I was like, "Oh, my god, where's my hair?!" But also, everyone kept me in good spirit. Everyone was laughing and telling jokes. Marvel are the best company to work for, they really are. They treat you really well. They made my hair into the most incredible well-made wig and they gave it to the Star Wars people. It's just so funny to think that my hair is made into a wig, next to all these Star Wars monster heads in a warehouse. I thought that was really funny.

Let that be a note to obsessive fans. Gillan doesn't care if you mess with her hair. Have at it.