If you're in the mood to watch the rise and fall of empires, ideally those not controlled by yourself anyway, you might want to check out Europa Universalis IV's newest expansion Emperor. As the name would suggest, the Emperor expansion brings with it a variety of new options for the Papacy and the Holy Roman Empire, new features for revolutionary movements and hegemonies, as well as a bunch of smaller improvements across the board.
You can get a brief overview of what all of this entails, as well as check out the recently posted story trailer, right below. Have a look:
A Powerful Pope
Appoint cardinals, publish Papal Bulls and gather tithes. The Vatican and Papal Controller now have new abilities to sway the souls of the Catholic faithful.
New Holy Roman Empire System
Deal with major imperial incidents that challenge royal power in pursuit of a centralized monarchy or decentralized confederation.
Revolutions Revamped
The spirit of Revolution is a contagion that must be either embraced or vigorously opposed. Use the guillotine and revolutionary guard to enforce the new way of thinking.
New Religious Mechanics
The Hussite faith has power in Bohemia, Defenders of the Faith have power based on the size of their religion, the Counter-Reformation offers new choices in dealing with Protestantism.
Hegemonies
If you accomplish great feats, you should expect great rewards. Seize the mantle of honor for accumulating great wealth and armies.
And more:
Over 20 new unique mission trees for a variety of European nations, provoke rebellions to deal with a problem now, many new events and options.
While the core idea behind Emperor seems to be pretty solid, there are unfortunately quite a few major bugs currently kicking around. So unless you're extremely eager to get your hands on some of the new toys, it might be a good idea to wait a few weeks and see if Paradox can get everything fixed up and ready to go. The extra wait might suck, but I'd say it's certainly better than getting needlessly frustrated with broken mechanics.
You can keep track of Paradox's progress, as well as learn more about the Emperor expansion, over at Steam.