Despite internet rumors to the contrary, Disney's Demi Lovato will not be synergistically starring in Marvel's Avengers movie, according to both Marvel and Lovato's reps. Sorry, fanboys.
More interestingly, however, the Hollywood Reporter's story on the rumor does contain this little piece of information: "Sources say Marvel is looking for another actress to, um, (un)beef up the lineup, although in typical Marvel secretive fashion, the role is not being revealed." The piece mentions the Wasp as a possibility, and the character has been mentioned in connection with the movie many times in the past - Remember when we all thought Eva Longoria might play her? - but, if Joss Whedon is to be believed, with no Hank Pym in Avengers, where would she get her powers from?