Upcoming Hearts of Iron 4 update will entirely overhaul Poland’s focus tree Hearts of Iron 4’s upcoming free Barbarossa update and as-yet-unannounced DLC will majorly rework Poland’s national focus tree. Revealed in a dev diary posted to the Paradox Forum earlier today, the update will introduce an entirely new tree, with additional and expanded branches, bringing major political reworks, changes to the independence of Danzig, and a historical Peasant’s Strike event. Release dates for the update and DLC are yet to be announced. The most notable change is the importance of Danzig, and its role in Poland’s international connectivity. To better align with its historical independence, The Free City of Danzig will begin each Hearts of Iron 4 game as a demilitarized zone, instead of a region controlled by Poland. No longer providing access to its factories, manpower, and resources, Poland will be granted the pernicious ‘Embargoed Economy’ trait to reflect its naval isolation.