Marvel Studios' Avi Arad said that the Iron Man movie is in "aggressive development" at New Line Cinema.
"We're dealing with casting issues and directing issues," Arad said during Marvel's second quarter conference call on Thursday.
The film was originally targeted for a November 2005 release, but might be pushed back to summer 2006.
"The November 2005 date is still attainable," Arad said. "But it's a fluid situaton. We should know more in 6-8 weeks."
Marvel also announced The Man-Thing movie from Lion's Gate won't be released until next year.
"That's probably a good thing," Arad said, nothing the movie is "in the can."
"We'll discuss in the next few weeks where we are going with it."
Arad attended last weekend's Comic-Con International in San Diego, where he appeared on a Fantastic Four panel with director Tim Story, fellow producer Ralph Winter and actors Michael Chiklis, Ioan Gruffudd and Jessica Alba.
"We got the reactions we were anticipating and hoping for for our cast," Arad said, noting physical production starts in two weeks for the July 1, 2005 release.
A rundown of other Marvel projects:
* Arad said Spider-Man 2 is approaching $600 million worldwide and has yet to open in several international markets. "We are very, very pleased," he said.
* Elektra finished principal photography on Friday. Daredevil star Ben Affleck reportedly filmed a cameo.
* Luke Cage, directed by John Singleton, remains a targeted 2005 release from Sony/Columbia.
* The Avengers animated DVD From Lion's Gate is targeted for first quarter 2006.
* X-Men 3 still is targeted for a May 3, 2006 release.
* Arad said a director is in negotiations for Namor, a summer 2006 targeted release from Universal Pictures. He didn't confirm reports that the director is Chris Columbus.
* Ghost Rider, written and directed by Mark Steven Johnson, is in pre-production and on targeted for a summer 2006 release from Sony.
* Arad said that The Punisher has generated more than $50 million worldwide and plans for a sequel continue.
*Development continues on The Hulk 2 at Universal, Spider-Man 3 at Sony, Doctor Strange at Dimension, Deathlok at Paramount, Silver Surfer at Fox and Black Widow and Iron Fist at Lion's Gate.
And while we're at it:
* Guess who's gonna be on Smallville next season? Michael Ironside!
* The con featured a panel on the upcoming Constantine movie.
* "The Batman animated series will be part of Kids' WB!'s new season launch on Saturday, Sept. 11, a network representative has confirmed for The Continuum."
* "The Krypto animated series will likely launch early next year on Cartoon Network."
* Here's a spoiler-filled rundown of upcoming episodes of Teen Titans.
* "Cartoon Network has acquired two new animé properties that will begin airing Saturday, Nov. 6, during Adult Swim, its late-night block of animation aimed at adults 18-34. Ghost in the Shell: Stand Alone Complex will air Saturdays at 11 p.m. (ET, PT), and Fullmetal Alchemist will air Saturdays at 11:30 p.m. (ET, PT)."