First of, if you want to watch everything new in the update before the release, there will be a showcase stream here on the 13th / 1 day before the update and DLC release

V14 Brings a lot of visual changes to the game like oceans no longer being a big flat colour and instead having a texture that slowly moves, fire and the new province type lava having smoke over it,

There is a new updated map for the native reservoirs within USA to be accurate to their actual shape and one new reservoir added (it had the super cute name "rosebud" so i had to add it).
and like 3 small southern island has been moved to antarctica and is no longer in the base game (this should have nearly no effect on people who don't get the DLC and only makes sense as they are a part of the Antarctic continent)

There is also a new world border as while working on the update I got annoyed at how the oceans are infinite, this world border will be togglable however incase you preferer the infinite ocean look.

and i think the biggest most energy draining visual change, new text placement code.
the game will now auto generate areas to place the text within instead of using 1 per country per sub continent, so now each country will have 1 text per area where all provinces border each other.

There has been 4 new events added and 1 event that has gained 3 (5 with the DLC) new variants of it

The first event added is "fortification" this event makes a country fortify a random notable site, this can be a city, world wonder or nuclear site. however the game will always pick the country's capital if it isn't already fortified and will favor cities.
after a province is fortified it will stop the province from changing hands 1, no matter what way it changes owner, Annexation, split, union, natural disaster, everything but the fortified status is removed immediately after it has been used.

the 2nd new event is "Volcanic Eruption" there has been 20 (23 if you own the DLC) Volcanoes added to the game map, each one with their own size/strength, if a country owns a volcano it will give a slight score boost, but if the eruption event happens the volcano will start spreading lava in multiple directions (depends on volcano size and location how many directions) creating a spider web ish pattern of lava, the lava then will each turn have a high chance of lighting 1 or more provinces around it on fire, but the lava will disappear after a while.

the 3rd and 4th event are sorta connected

the 3rd is "advanced robotics" this event will give a random country a prestige boost if their city is selected, that city will then get the status of having advanced robotics, any city in a country with a minimum of 1 city with advanced robotics will automatically gain the status a well.

and the 4th event is "robot uprising" this event selects a random city with the advanced robotics status and creates a new randomly generated Robot or AI nation, it can however only happen to countries with more than one city

and then the changed event is hurricane, if a hurricane goes over Fire, Flooded or lava province the hurricane will pick it up, changes it's colour and start spreading that province type, there is 2 more province types that this can happen to that will be mention in the DLC section of the post.

and lastly there has been 4 new camera movement buttons added
Q and E now rotates the camera and R and F now tilts the camera, though I do recommend not using it too much, just a fun quick thing I added

the zoom speed has also been changed to be slower the more zoomed in you are and the area the camera can be in and start location of camera has changed slightly

And then the big thing, AntarcticaRoyale,

This DLC adds the entire continent of Antarctica to the game
with multiple starting settings (claims, unclaimed, snow, glacier, research bases and off)

and with that there's also 2 new province types, "Snow" which slowly turns into floods over time as it melts and "Glacier" which is un destructible (sorta) and creates snow around it over time,
there is a lot of glaciers in antarctica at start but it can also be found in Alaska, Greenland and Siberia

There is a new "status" for the entire game called "Antarctica treaty" It's a treaty that creates a few randomized negative score effects on any country claiming antarctica, 1 for having any land there, 1 for each new claim made, and 1 for any old claim pre signing

there is 5 new events in the dlc (6 if you count a secrete one that has sadly been delayed to a few days after release) and 2 new variants to the hurricane event

first of the hurricane event just like mentioned in the v14 section of the post, will now start spreading a few select province type if it goes over one, both glacier and snow can be "picked up" by the hurricanes.

first 2 events added is kinda boring but has a huge impact on the game
first one is "dissolve antarctica treaty", it completely removes all negative score impacts from the treaty making any country with big claims on antarctica over powered.

the 2nd one is "new Antarctic treaty" this event creates a new treaty with new randomized penalties and can give a huge nerf to any Antarctic nations

the 3rd new event is "snow storm" it creates a big chunk of snow on the map with a low chance of the center being turned into glaciers, it also creates a cloud over it that will fade away within 7 seconds, the event can also only happen in the north and south of the map

the 4th event is "melting glacier" this is the only way to get rid of glaciers and it turns all glaciers and snow within a small area instantly into floods

the 5th and last event is "research base" this allows a country to turn any unclaimed or snow province in antarctica into a new claim, and unlike the colony event, this doesn't need to be a coastal province

and lastly there is a "6th" secrete event that was and is still planned that i sadly didn't have time to finish before the release date and will work on adding into the DLC in a update a few days after release, it's a short super rare "story" of multiple events

also as mentioned in the V14 section the DLC adds 3 volcanoes on the continent

hope you will enjoy all the new content to the game both if you get the DLC or not <3