Slow...but am not really sure if it's because of CS/patch or not. The challenges I'm having don't really have much to do with the new features. Am still pretty new; did well with Castile/Spain in 1.11, but then that's a newbie nation. Decided to go Brandenburg for my first 1.12 campaign, which is also my first true HRE game.
Have done a couple of restarts...the basic problem is the Catch-22 of alliances; need them in order to be somewhat protected against aggression and have an edge on whoever I decide to attack...but those same allies aren't always willing to come along on offensive wars, and often drag me into unwanted wars of their own. I don't think that's a Brandenburg-specific problem, more just me feeling my way through trying to navigate a nation which doesn't start already large. Then there's the whole HRE thing; I managed to become Emperor as Spain in earlier game (kinda fell in my lap), so have some familiarity with the mechanics, but now I'm trying to figure out how to get anything done militarily within the HRE (specifically, make some gains against Pomerania) without Austria jumping on me.
I know that Brandenburg's NI will eventually lead to a great army, but that's going to take a while; those advantages aren't here yet. So I'm trying in good faith to pursue the development thing, and grow my 7 provinces while trying to get involved in as few wars as possible. I'm thinking I'll try to get them all to at least 10 development (for 2 bldgs), get at least one full Mil Idea finished, get to the first Prussian military-related NI, and hopefully diplo-vassalize one or two OPMs (yes, I'm looking at you, Anhalt) before I really start trying to militarily expand. At my level of experience, I don't know if this is "smart" or "unnecessarily timid".
I do know I tried to go pretty aggressively in earlier start, vs Pomerania, TO, and Saxony. Had Austria, Bohemia, and Poland as allies. Initially went very well...but then got dragged into endless wars by those allies, and just got caught in an endless manpower-drain downward spiral.
I do really like the new feature of being able to take provinces and humiliate rival in a peace settlement...+50 power projection much easier to attain now.