The Marvel Cinematic Universe's Avengers team may soon be counting some new super-powered heroes among their ranks who are clearly more useful than Hawkeye. At the recent Iron Man 3 premiere, Avengers writer-director Joss Whedon heavily suggested as much, telling The Hollywood Reporter that, among new characters, "There may be a brother-sister act from back in the days when I was reading [the comic]." As Donny and Marie have only ever shown affiliation with Superman, thoughts have naturally gone to Scarlet Witch and her brother, Quicksilver.
They're the daughter and son of Magneto, which you'd think would put them in the possession of Fox and their X-Men universe, but according to Marvel Studios' Kevin Feige, since they were also Avengers members, the rights are split and both studios can use the siblings. Lawyers have already been paid to work out the legal details of a super-fast guy in baby blue spandex and his witch sister, so don't you worry about that.
Oh, and if you didn't know, Quicksilver is a super-fast guy in baby blue (originally green, as you can see above) spandex, and Scarlet Witch is a witch and she wears reddish stuff. But Joss Whedon will explain all that to you in 2015.