It’s been nearly four years since Michael Mann last directed a feature film, but the wait for his next project may be over: The “Public Enemies” director has attached himself to helm an untitled thriller for Legendary Pictures with Chris Hemsworth attached to star.Mann had been developing the project for over a year, co-writing the script with Morgan Davis Foehl, who is also penning “Mass Effect” for Legendary. Plot details are unknown, other than that the film takes place in a world of cyber threats and attacks. Thomas Tull, Mann and Jon Jashni will produce with Alex Garcia exec producing. The CAA-repped Mann had most recently produced “Witness” and directed the pilot of HBO’s “Luck,” which he also exec produced but has not helmed a film since Universal’s “Public Enemies” in 2009. Mann has since been linked to a handful of films, including “Big Tuna, “Agincourt” and the racing pic “Go Like Hell” for Fox. Mann continues to develop each of those films. Though Mann has shown range in other genres like “The Insider” and “Ali,” he has made a name for himself tackling films set in a world of cops and criminals like “Heat” and “Collateral.” New project would seem to fit that mold. With “Robopocalypse” being delayed and things moving slowly on the sequel to “Snow White and the Huntsman,” Hemsworth had been figuring out what to do next. He’s attached to the Warner Bros. adventure “In the Heart of the Sea,” which Ron Howard is circling. WB very much wants to make “In the Heart of the Sea” but doesn’t think it would be able to get production started until fall. Plan is to shoot the Mann pic in June before that and then jump into “In the Heart of the Sea” after. The CAA and Roar-repped Hemsworth can be seen next in “Rush,” directed by Howard, which opens Sept. 20, followed by Marvel’s “Thor: The Dark World,” which bows Nov. 8.