The first teaser trailer for the third instalment was released earlier this year, and was taken by many fans as an indication of the film's darker, more serious tone.
"It's not a serious movie," Feige told The West Australian, "but we seriously dig into exploring more of Tony.
"The trick is just trying to make great movies. We try to make them all great, all different and all fresh. What you'll see in Iron Man 3 is some very unique directions that were taken."
Recently Feige also praised Ben Kingsley's performance as the villainous Mandarin, a character originally of Chinese extraction whose ethnicity will reportedly be "blurred".
Robert Downey Jr reunites with his Kiss Kiss Bang Bang director Shane Black on Iron Man 3, which also stars Rebecca Hall, Guy Pearce, Paul Bettany and James Badge Dale.
Iron Man 3 will be released on April 26, 2013 in the UK, and May 3 in the US.
Watch the first trailer below: