This video offers a look at a little alternate history as depicted in Hearts of Iron IV showing the fall of England if Germany's Operation Sea Lion had been successful. Here's word on how this plays out in the World War II strategy sequel:

The trailer shows air strikes on the British homeland, combat around the capital and demonstrates how players can follow the war on the map through descriptive arrows and animation. In Hearts of Iron IV, like all Paradox grand strategy games, history changes the moment you start your game.

Hearts of Iron IV will be your chance to revisit the last titanic military struggle between the world’s greatest powers. You have complete control over a nation’s industry, military doctrine, political goals and strategic planning. Assign your fleets and air wings to areas of operation, draft your invasion plans and keep your war economy running by protecting your convoys.