Timeline
June 17, 2013: The Hollywood Reporter:
Sony Sets Release Dates for Third and Fourth 'Amazing Spider-Man' Films ("Sony has set release dates for its third and fourth Amazing Spider-Man films, which hit theaters on June 10, 2016, and May 4, 2018, respectively.")
June 19, 2013: Entertainment Weekly:
Shailene Woodley on getting cut from 'Spider-Man 2': 'Of course I'm bummed' -- and more on 'Divergent' (Woodley: "MJ only appeared in a few scenes and I wouldnt trade the experience of working with Andrew and Emma for three days on set for the world. Based on the proposed plot, I completely understand the need for holding off on introducing MJ until the next film.")
June 19, 2013: Deadline:
Shailene Woodleys Mary Jane Role Cut From The Amazing Spider-Man 2′; Actress Out Altogether? (Webb: "I made a creative decision to streamline the story and focus on Peter and Gwen and their relationship. Shailene is an incredibly talented actress and while we only shot a few scenes with Mary Jane, we all love working with her.")
June 20, 2013: Movieweb:
Is Sarah Gadon the New Mary Jane Watson in The Amazing Spider-Man 3? ("We're hearing this morning from a source very close to the production that Mary Jane Watson has already been re-cast. If we're to believe this news, Sarah Gadon is our new Mary Jane Watson")
June 20, 2013: Entertainment Tonight Canada Twitter: Huge news for @sarahgadon - she just confirmed to us that she is joining The Amazing Spider-Man franchise
June 21, 2013: The Toronto Star:
Sarah Gadon and Shailene Woodley in web of Spider-Man rumours ("'Thats all we can say,' her reps told the Star. A Hollywood source told the Star that Gadon is not taking over the role of Mary Jane, and has only a brief appearance in the next movie.")