The "announcement" is
here at 23:30.
It's main focus is apparently going to be about the thirty year war and and the napoleonic era. You know that time period where 99% of games won't reach because the game gets ridiculously boring once you've managed to blob up.
It's apparently going to add more depth to combat and add "customisable armies", whatever that means. There is a strangely thick line in one of the screenshots that almost makes me think of fronts like HoI, doubt we'll see that though.
From the leaked screenshots there's also going to be improvements to Africa and likely the rest of the world as well such as increased tags and provinces. However it seems like that will just make more territory for Europeans to blob into.
Ultimately I'm really disappointed. It may be a bit early to judge and things might start looking up once the dev diaries start rolling in but it just seems like it's completely the wrong expansion we need right now. The game festers while having such a major focus on conquest but so many barriers put in place to do so. Barriers would be fine if there was some other mechanic to keep the game interesting while not at war but that aspect has been completely neglected.