The Hollywood Reporter earlier revealed that Bradley Cooper was in talks to join Marvel Studio's Guardians of the Galaxy (as a talking raccoon no less), but that didn't end their scoop for upcoming Marvel films. Elisabeth Olsen is the next in line to join the Marvel Cinematic Universe, with the actress in "final negotiations" to play the probability altering Scarlet Witch in Joss Whedon's Avengers: Age of Ultron. The character, along with her brother Quicksilver, was the subject of a rights controversy earlier in the year, with both Fox and Marvel Studio's owning the rights to them, due to their shared history with both The Avengers and X-Men. If Olsen agrees, she will join other newcomer Aaron Taylor-Johnson, as her cinematic sibling.
Avengers: Age of Ultron is released the 1st of May 2015.