Chris Cooper has signed on to portray Norman Osborn in The Amazing Spider-Man 2. While we knew that Oscorp was featured in director Marc Webb's sequel, Norman Osborn's casting has never been confirmed until now. Dane DeHaan is playing Norman's son Harry Osborn.
It isn't known at this time if Norman Osborn will transform into The Green Goblin in this sequel, or if they are holding off on using that villain for The Amazing Spider-Man 3. In the comic books, Norman Osborn starts out as a mentor to Peter Parker, before his villainous turn. The character was originally portrayed by Willem Dafoe in Sam Raimi's Spider-Man trilogy.
The Amazing Spider-Man 2 already has a notable villain in Paul Giamatti's The Rhino, but it is possible there may be dual villains. Andrew Garfield and Emma Stone star as Peter Parker and Gwen Stacy, with Jamie Foxx playing Electro, Shailene Woodley portraying Mary Jane Watson, and Sally Field and Martin Sheen reprising their roles as Aunt May and Uncle Ben.