We can for instance quote this question where we have been talking about the possibility to move a greater amount of units comparing to the original version of the game. Great news, but this update also comes with some consequences for the modding scene regarding mods dependent on the popular utility Skyrim Script Extender (SKSE). While it would be ridiculously long to enumerate all those changes here, we can at least say they cover a lot of different points: upgrading performances and rendering, fixing bugs, balancing the units, upgrading the AIs and other convenient points.
It's also important to note that a team keeps working on patching the HD version of the game. There are three paid expansions, The Forgotten, The African Kingdoms and Rise of the Rajas which are exclusive to this version of the game. It also supports user-generated content through the Steam Workshop and multiplayer games provided through the Steam servers. Age of Empires II: Definitive Edition celebrates the 20th anniversary of one of the most popular strategy games ever with stunning 4K Ultra HD graphics, a new and fully remastered soundtrack, and a brand-new expansion, The Last Khans with 3 new campaigns and 4 new civilizations. The HD Edition includes both the original game and the expansion The Conquerors, as well as updated graphics for high-resolution displays. There are differences between the two games, but they are mainly graphical or Steam-related.
