While Steven Spielberg’s eye is on directing “A.I.,” he’s also focused on finalizing the script for his follow-up film, “Minority Report,” so the Fox/DreamWorks pic can begin production next April with Tom Cruise and possibly Matt Damon in the starring roles. Apparently, he’s asked Frank Darabont to do a polish. Originated by Jon Cohen from a Philip K. Dick story, the “Minority” script has been through many writers; most recently, Scott Frank and Spielberg spent over a year working out structural problems in the complicated sci-fi premise. Frank was unable to return because of other script obligations. Meanwhile, Darabont, whose last film was the Oscar-nominated Castle Rock smash “The Green Mile,” is trying to hook an A-list star for his next Castle Rock pic, “Bijou.” He’s repped by William Morris.