LEGO has a no violence policy. While more recent themes (Wild West, Star Wars, Indiana Jones, Exo Force) have had modern war elements, an actual World War theme is out of the question. The great wars are not something that has become fantasy. Wild West has been romanticized. Star Wars is science fiction. Indiana Jones is a pulp action movie. But World War One and Two? There is nothing fantastic in thousands of soldiers being mowed down as they go over the top. The closest thing to those sets you'll see any time soon are the fighter plane models and Indiana Jones.