In a recent interview with The Los Angeles Times, helmer Jon Favreau said work on the "Iron Man" sequel has already begun.

I know that's not exactly the most exciting information, but at least we know the project is already in development.

Marvel and Paramount are shooting for a late April release date in 2010. The first film opened this May and pulled in $316.4 million domestically. 

Penning the script for the anticipated sequel is Justin Terhoux, who most recently co-wrote Ben Stiller's "Tropic Thunder." His acting credits also include "Mulholland Dr.," "Charlie's Angels: Full Throttle" and "Miami Vice."