Wars of Liberty remade the church entirely. Now, it's available for all civilizations in the game and lets you choose a religion, which enables a new resource, faith. With faith you can train priests, which are now much more strategic, and research new religious technologies with amazing and game-twisting effects. Currently, there are 16 different religions, and each civilization has access to 2 plus Laicism.
Spies are stronger than ever! Now all civilizations have access to a new building, the Safehouse, which lets you train the spy. This stealthy unit is capable of planting landmines, stealthy kills and detonate bombs on enemy buildings. Watch out: Town Centers cannot reveal spies anymore, so you'll have to counter them with your explorer or with your own spies.
Who said Imperial Age was the limit? In Wars of Liberty, you'll reach the sixth age, Great War! At this highly expensive age, you'll have access to the ultimate technologies and three new types of units: airplanes, tanks and dreadnoughts!
You will notice some cultures have nasty tricks to deal with invasor Empires. One of them is fire, which is casted by several civilizations in different ways. In case you see a fire, send immediately some villagers there to put it down before it spreads - if that happens, it will quickly consume all your buildings!
We all know Age of Empires III is a 10-year-old game. And that poor 1024x768 resolution won't last much longer. In Wars of Liberty, all user interface images are 4x the original resolution, so when stretched, everything will still look sharp even in large monitors.
Artificial Intelligence too predictable? In Wars of Liberty, the AI starts with a random personality trait that grants them an unique bonus for that match. They'll give hints of their current personality during the game. The traits are random, but you'll see some Leaders get some traits more often than expected. There are 30 different personality traits.
Bored of the usual gameplay? Some Wars of Liberty random maps have special game twisters for you. Avoid the dangerous area in Bermuda Triangle or the headless knight in Deathly Hollows. Hold your breath on the Moon, protect yourself from the LOS reset in Congo.
All villagers can quickly put down a fire and don't get really hurt; fire is devastating against buildings and will hurt military units as well. Also, have in mind that fire may hurt the caster as well.