In an article from Cosmic Book News actor Don Cheadle has been quoted that the finale of Iron Man 3 with be bigger and badder as it is now in re-shoots.
"I’m not supposed to say that he kills Robert Downey Jr.’s character. Is that a spoiler? That would be a spoiler. You knew that was coming. You read the comic books. No. I will just say that the buddy relationship that these guys have gets tighter. The third act set piece for the big finale is bigger and badder. It’s just a lot more." says Cheadle.
You can read the entire story here: http://movies.cosmicbooknews.com/content/iron-man-3-doing-re-shoots-fina...
Here is the official synopsis from Marvel Studios:
Marvel Studios’ “Iron Man 3″ pits brash-but-brilliant industrialist Tony Stark/Iron Man against an enemy whose reach knows no bounds. When Stark finds his personal world destroyed at his enemy’s hands, he embarks on a harrowing quest to find those responsible. This journey, at every turn, will test his mettle. With his back against the wall, Stark is left to survive by his own devices, relying on his ingenuity and instincts to protect those closest to him. As he fights his way back, Stark discovers the answer to the question that has secretly haunted him: does the man make the suit or does the suit make the man?
Starring Robert Downey Jr., Gwyneth Paltrow, Don Cheadle, Guy Pearce, Rebecca Hall, Stephanie Szostak, James Badge Dale with Jon Favreau and Ben Kingsley, “Iron Man 3″ is directed by Shane Black from a screenplay by Drew Pearce and Shane Black and is based on Marvel’s iconic Super Hero Iron Man, who first appeared on the pages of “Tales of Suspense” (#39) in 1963 and had his solo comic book debut with “The Invincible Iron Man” (#1) in May of 1968.
“Iron Man 3″ is presented by Marvel Studios in association with Paramount Pictures and DMG Entertainment. Marvel Studios’ President Kevin Feige is producing and Jon Favreau, Louis D’Esposito, Stephen Broussard, Victoria Alonso, Alan Fine, Charles Newirth, Stan Lee and Dan Mintz are executive producers. The film releases May 3, 2013, and is distributed by Walt Disney Studios Motion Pictures.