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There's a campaign and assorted goodies, but I'll just focus on the new nation, who's making their first ever appearance in the Cossacks franchise:

~~Scotland~~

Like Ukraine, Scotland has an entirely unique playstyle unlike any other nation. Scotland can't advance to the 18th century, though they get the same extra-expensive balloon to reveal the map in the 17th century as Ukraine. Their cavalry is mediocre and their artillery and navy are standard, but their infantry is where they shine.
Scottish infantry is divided into two branches: Covenanters (the name for followers of the de-facto government of Scotland during the English Civil War) and Highlanders. Covenanters train at the standard barracks you know from every other faction, and they come in pikemen and musketeer form. The Covenanter musketeer is pretty standard, but the pikeman trades the armor on most other European pikemen for a faster attack rate, making them worse at tanking enemy fire but better in melee. Not having armor does hurt, especially in the late game when you can expect to face lots of strong musket-armed troops, but they're still a good unit, and their hats are great, so they get a pass in my book. Besides, you don't get any 18th century units, so get used to them being the fashionable backbone of your armies.
Highlanders are trained at a special Castle building, and they're by far Scotland's best units. They come in swordsmen and archer variants. Swordsmen are beefy, fast-moving infantry that will chop through just about anything. Fully upgraded these guys allow Scotland to keep up with other nations' 18th century Musketeers. Even Spanish and Swiss pikemen are no match for these kilt-totting lads! Archers are long-range infantry with a strong attack that can also hurt buildings. Both of these units are more expensive and slower to train than Covenanters, but the fact that they train from a separate building means that you can pump out both Highlanders and Covenanters without a problem.
Scotland is best played as an aggressive faction that starts attacking early on, but they can still hold their own if the game goes late. The bulk of your armies will initially be made up of Covenanters, but as the game goes on you'll add more and more Highlanders to bolster your Covenanter forces. You'll never field as fast or powerful a rush as Turkey or Algeria (especially Algeria), but you scale into the late game better than they do (especially, again, Algeria). Just beware of getting into prolonged shootouts; Scotland isn't helpless at range, but it isn't their forte, and you'll never outshoot an 18th century musket army. Instead, you should be running at your enemy with sword or pike in hand in a good old-fashioned Highland charge! Get into melee fast so you can minimize the time your poorly armored troops are taking fire. Your Highlanders are good enough to be competitive with most nations' 18th century Musketeers (yes, the unit that dominates the late game), so don't be afraid to take engagements with them.
And whatever happens, make sure you're using both Covenanters and Highlanders together; Highlanders don't train quickly enough to replace Covenanters as the bulk of your armies. Remember that many times in their history the Scots' internal divisions left them weak and divided when a crisis overtook them. Don't fall into the same trap.
Overall, Scotland is a very fun nation to play as, and they offer an experience unlike any other nation. They've swiftly become one of my favorite nations in the game. If future nations added have this much thought and care put into them, then the future of Cossacks 3 is bright indeed.