My first impressions: I played for a half hour this morning before work. I played as France. I started a fabric factory in Normandie since that area would get a bonus for having cotton. I was concerned about initial factory layouts ignoring the new "resource synergy" rules.
I did my usual "put influence in every area another GP has 25 points in", and sure enough, I got badmouthed in 50+ countries, rreducing mucho influence from my rivals.
The naval slider was awesome! I hated manually setting my clippers to 0 and artillery to 0. As France, my minimum naval slider was 25%, which was still pricey.
I spent some time dealing with the fact that I had so many different cavalry to choose from, and I thought "This is unneeded complexity". I have read the DD and AAR's, so I knew about the shock vs the recon vs the useless(basic cavalry). I couldn't decide how much cavalry a 30k man army should have. I appreciated the increased support limits, I always thought 18000 men was way too few to garrison my prussian border.
Navy-wise, i see I can add 3 or 4 commerce raiders instead of 100. I used to literally add 5 or 6 commerce raiders in every single province of France and North African France so that by 1842 or so, I'd have 300 commerce raiders to fight England with. Now, I'll have to make some sacrifices, probably starting with removing all my frigates, and then phasing out my Man of War ships and replacing them with CR's as well, while building naval bases in all states.
And that's it. A very limited set of impressions since I only played a tiny bit. Overall solid improvements. Didn't notice the "creazy release-dominion" thing, but I'm pretty sure when I left it was still the first week of Jan in 1836.