"It appears the studio's relationship with the New Orleans filming office is at it's peak and neither party wishes for it to end when Green Lantern enters post production in Los Angeles next week. Location scouting for the untitled Batman project has already begun in Chicago, Illinois, where the two previous films were headquartered. If this new deal finalizes, almost half of principal photography will take place in New Orleans, Louisiana. This deal would be a big help to the studio financially, since it would allow better use of the projected $200 million budget for the film."
Batman 3 is apparently scheduled to begin production between March and April, 2011.