3D is very in vogue for big movie releases, even to the point of conversions for films that weren’t originally intended for the display medium. Iron Man 2 was not released in 3D and still reached opening weekend heights of $133.6 million, but Marvel was considering it in the wake of the success of Avatar and Alice in Wonderland. Post-production demands of Iron Man 2, however, meant there simply wasn’t enough time to meet the May 7 release date
“We couldn’t have turned over a version of the movie 10 or 20 weeks earlier for 3-D conversion without undermining the quality,” said Marvel Studios President Kevin Feige . “We used all the time we had for mixing and editing and discovering the right tone.”
Foresight, however, might mean that upcoming Marvel films Thor, First Avenger: Captain America and The Avengers could either be converted to or filmed in 3D. “The team has been doing a lot of research into 3-D processes, and we’re looking at it on future films when we have the time,” said Feige. “We will be doing it at some point.”
Source: L.A. Times