From :

HitFix states that while they can’t get confirmation, they’ve heard that some “very cool” Spider-Man plans are being discussed which, “would help Sony refocus their enormously important franchise while also opening up some connections in the onscreen Marvel movie universe that would blow fandom’s minds.”

While Marvel don’t have a particularly good relationship with 20th Century Fox (the movie studio which own the rights to the Fantastic Four and X-Men characters), they hold the merchandising rights to Spider-Man, so including him in an Avengers movie would very much work to their advantage.

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