Ele provavelmente assinou apenas para um: Age of Ultron.
(Por razões óbvias)
De IMDB :
It took Joss Whedon a year to convince Aaron Taylor-Johnson to accept the role of Quicksilver. Johnson was concerned over the intensity of the Marvel contracts, the time constraints, and the fact that it was going to be such a large cast. Even after he accepted the role, he was still nervous, but was comforted after he learned that his friend and Godzilla (2014) co star Elizabeth Olsen would be playing his sister and would be his filming partner through most of the movie.
Esta é a única informação que posso encontrar ...