Start in October 1399 and the coronation of Henry IV of England. Experience over 50 more years of gameplay, experiencing the Byzantine Empire, Tamerlane and the end of the Hundred Years War.

Better overview of the decisions needed to shape the future of your country. Strive to create Great Britain, Make Paris worth a Mass, or institute an East Indian Trade Company. Act, rather than react, and implement decisions on both country and province level, with the new decision system, including hundreds of different decisions depending on situation.

Experience the new Mission System, where the player and AI alike will be given goals to achieve, providing endless replayability by guiding history along different tracks every time.

Rebels with a Cause. There are countless types of rebels, all with different goals, and different abilities. You may get colonial rebels in your colonies determined to get representation or independence, you may get reactionary nobles rising up to put the serfs back where the belong. Crush them by force, or negotiate with them, or even worse, watch them enforce their demands on your country.

Religious tolerance now depends on the ideas and decisions you take, making it a new layer of strategy. As cardinals stay loyal longer, the power of the Papal Controller has grown, as he can now excommunicate rulers, and call crusades against infidels.
Revised AI, focusing on strategic top level goals, with support for fully scriptable logics.

Source: Gamersgate.com (Paradox DD system)