I'm really excited for the new Reformation mechanics and Thirty Years War. Ending the game with the revolutionary and counterrevolutionary forces going at it sounds like a blast as well. The navy streamlining should be great too. I saw a few saying it is "immersion breaking." As someone who likes immersing myself in the period as well, I can't help but find the need to manually build a new ship and delete the old ones to be needless tedium, so tedious I've taken to usually just waiting to upgrade for when they get killed in battle. As someone who likes to play naval powers, when I really started playing this game a couple months ago one of the first things I thought when I unlocked the first ship upgrades was "I wish I could just click to upgrade my ships." Anyway, assuming this expansion is well-balanced and bug-tested, it will probably be one of my favorite expansions I've ever purchased.