Article continues below advertisementLeonardo DiCaprio is feeling the heat - over Heat 2, with sources telling OK! the 51-year-old actor is under "intense pressure" as he edges toward what will be one of the most physically demanding roles of his career.The long-awaited sequel to Michael Mann's 1995 classic Heat is finally moving forward, with the 82-year-old director set to return and DiCaprio set to play gun-toting gangster Chris Shiherlis, originally portrayed by Val Kilmer. The film, which has shifted from Warner Bros.