Armchair Commander: The biggest update this year - an entirely new tech system has been added to the game! Technology of countries now vary from 1936 to 1980, meaning the same units can have vastly different stats. This value can be set individually for each country in the map editor, and the player gets to unlock tech from the shop. An option to override the player's tech for your own maps is also available in the editor.
Generals now also have up to three unique abilities: they range from healing to terrain bonuses and critical hit chances, making them much more powerful for free! All abilities come with the hired generals for free. With the right conditions, you can get up to 1000 damage from a single attack!
You can't just buy your way through the tech tree, because lots of tech require you to complete certain missions.
Ability example: a level 5 mechanic heals 5% of the unit's max health every round for free
Example of all the right conditions: 1980 modern tank with max veterency and Guderian, which gives 40% bonus damage to armored vehicles, +20% damage on plains, and and chance to deal a critical hit that doubles damage versus 1936 light infantry.