Joss Whedon (The Avengers) has confirmed that the brother-sister team that will be included in The Avengers 2 will indeed be Quicksilver and Scarlet Witch.
There was a potential legal issue with these characters as they are intertwined with X-Men seeing as they are both mutants and their father is Magneto. The concern was since Fox owns X-Men they could potentially own these characters as well.
There was a potential legal issue with these characters as they are intertwined with X-Men seeing as they are both mutants and their father is Magneto. The concern was since Fox owns X-Men they could potentially own these characters as well.