The House of Lies star, who reprises his role as Colonel James Rhodes / War Machine in the third instalment, shows off his new look in the latest Marvel artwork.
Cheadle has previously revealed that his character becomes closer with Tony Stark (Robert Downey Jr) in Iron Man 3.
"I will just say that the buddy relationship that these guys have gets tighter," he teased. "The third act set piece for the big finale is bigger and badder. It's just a lot more."
The Shane Black-directed film recently unveiled an official picture of Rebecca Hall as scientist Maya Hansen.
Praising Black's work on the movie, Hall said: "[Shane] has got a really wonderful understanding of pulp - of kind of that mainstream commercial movie - and also he has a great wit and intelligence, which adds a lot of spice to whatever he does.
"And it's sort of black... not to use an unfortunate [pun]!"
Iron Man 3, which will be released in IMAX 3D, arrives in the UK on April 25 and in the US on May 3. Watch a trailer for the film below: