Potential spoilers follow...

For the past few months, Joss Whedon has been plugging away on his script for Marvel's The Avengers 2 . And in a recent interview, the writer-director revealed that he already has a first draft done, with rewrites now in progress. More interestingly, though, Whedon teased a potential bombshell that could indicate the appearance of one certain comic book duo...

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"I've got these two characters, two of my favorite characters from the comic book, a brother-sister act. They're in the movie," Whedon told Yahoo! Movies at the Iron Man 3 premiere.Most outlets are theorizing that this "brother-sister act" would be Quicksilver and Scarlet Witch. The thing is, Marvel doesn't have the screen rights to these two characters outright -- they share them with Fox (having first appeared in the pages of X-Men before becoming Avengers themselves). However, Kevin Feige noted last year that, as long they didn't "discuss or reference their mutant or Magneto-related lineage," then the characters could potentially show up in The Avengers 2.Having said that, Whedon is known for his cruel sense of humor when it comes to teasing projects, so the quote could also be a huge misdirect. Still, it's something to keep in mind as we look towards Marvel's franchise sequel.

Max Nicholson is a writer for IGN, and he desperately seeks your approval. Show him some love by following @Max_Nicholson on Twitter, or MaxNicholson on IGN.