-The Game is in very early development (Kallocain)
-It's expected to be released Q3 2013 (Announcements)
-The System Requirements will be the same as with CK2.
-You still play as the country, not the ruler.
-Teh game run on the Clausewitz 2.5 engine, an upgrade of the Clausewitz 2 engine of Crusader Kings II. (Johan)
-There will most likely be a Mac version. (Johan)
-EU4 is based on EU3 with all expansions.
On DRM, Steam, DLCs, and DVDs
-Paradox doesn't like to have DRM on their own titles when they can avoid it.
-It's doubtftul that there will be a physical release of Paradox games from 2013 onward. (Johan)
-Every country will always be playable, there won't be DLC locking away countries (Johan)
GENERAL GAMEPLAY STUFF
-They are trying to make the game as accessible as possible while remaining complex.
-The game span over 300 years (Announcements)
-AS OF NOW, the start date to the game include Byzantium. This is subject to change. (Captain Gars)
-Screenshots of 1445 have been seen. (Screenshots)
-The time frame is similar to EU3, but slightly different (Kallocain)
On the map
-Winter will have effects, and parts of the ocean may freeze (Besuchov)
-It has been significantly changed from EU III. (Johan)
-The Map will attempt to reflect a lot of information.
ON ARMIES AND NAVIES
On the military
-The military system will get an overhaul.
-Fleets are going to have a more important role, because of their role in the trade system (Besuchov)
TRADE, DIPLOMACY (and other agents stuff)
-There are four agent types (screenshots)
-One of them is the merchant (Besuchov)
-Military access and the right to base fleets in a country are now separate agreements.
-Detailed support for rebels will be included (Announcement)
-Unilateral opinions: it's possible for you to be neutral to a country while they dislike you (announcement)
-The relation system is now that of CK 2, not an arbitrary value but a specific one allowing you to see why it's that way.
-Coalitions are now in the game (Announcement)
-They're a targeted alliance to attack a specific country or defend against a specific country.
On Trade Routes
-The Trade Routes are static, with their normal direction and flow.
-You send your merchants at various points on the trade routes to try to suck trade from them your way.
-You can also expand your trade by acquiring territory and bases across the world.
-You can use your small ships to control where trade goes.
Inflation and Minting
-Minting is no longer a source of inflation (and may be gone completely, it's hard to decide what the quote means).
-Inflation will result from gold mines, loans, war taxes, or serious economic mismanagement.
-It will be easier to fix, but you will have to give something up.
Countries and History Files
-There are over 250 playable countries in the span of the game. (Announcement)
-There are over 1000 leaders and 4000 monarchs. (Announcement)
-There will be thousand of historical events to guide you and provide flavor. (Announcement)
-the aim is to make each country feel different without railroading them.
-These historical events will pop up when they're supposed to, but you will be free to make your own history.
-There will be many more events unique to countries and years.
-The Trade system will be all new. (Announcement)
-It's fairly advanced in its implementation but they're not ready to give details until it's ready (King)
-Controling ports and expanding your navy will assist your trade operatoins (Announcement)
-Merchants (the agents) are still part of the game for the trade system. (Besuchov)
On history and determinism
-The game is not going back to the determinism of EU II (Captain Gars)
-History will play a larger part (Captain Gars)
-Burgundy continuing to exist after 1477 is not seen as a problem by Paradox. They want plausible, not determined (Johan)
-EU 4 will have the same open outcomes as EU3 (Johan)
On Rulers and Dynasty
-There will not be CK II-style family trees and family dynamics (Besuchov)
-We will still be able to see who the heir is (if any) (Captain Gars)
-There is a mechanism involving random rulers after your starting one, but it's a bit more interesting than that (Johan)
On the Monarch
-Your monarch and his qualities (or lack) will really impact gameplay and the challenges you will face (Besuchov)
-This will take the form of more than a few modifiers (Besuchov)
-The system is somewhat inspired from CK II, although you still play the country (Johan, SI interview)
-There are no plans for monarch portraits (SI Interview)
-More military monarchs will have access to more military initiatives. More peaceful one will have better ability to make deals
-They want the players to feel like history is being shaped by people.
-This applies to all leaders, not just monarchs
On Monarch powers
-Monarch get points based on their Administrative, Diplomatic and Military ratings
-These points can be traded to use a variety of abilities.
-Known abilities: Forced March, Assault, Making a Leader, Increasing Technology, Coring a province, buying ideas.
-This will sometime result in powerful nation that get a bad ruler stagnating, allowing other nations with better rules to catch up.
-Leaders will work primarily as in EU3
ON COUNTRY MANAGEMENT
-Buying ideas is a monarch power.
-There will be country-specific national ideas.
Modding in general
-The game will be very moddable (Announcement)
-The modding language is based on EU3, but expanded, more constant and more flexible (Captain Gars)
-Adding many provinces and tags to the game will always cause lag (Johan)
-The game will be optimised for how many tags they need, expecting about a 10-20% increase in tags. (Johan)
-The map will be very moddable (Besuchov)
-The game will not be compatible with old (EU3) map mods due to a few changes made.
ON OTHER GAMES
Compared to EU3
-There will be some things in EU IV very similar to EU III; these are the parts the developers felt worked and were popular.
Features from other games
-There will not be a Victoria-style pop system in EU4. (King)
-There will not be a Rome-style pop system in EU4 (King)
-It's too late to change this (King)
-There will not be multiple settlements inside one province ala CK II (Johan)
-There are no plans to do an official CK2-EU4 converter at present. They're hard to create (Zoft)
-The game will not integrate features from Magna Mundi (Strategy Gamer interview)
-The game was well advanced in planning before the MM cancellation decision was made. There is no connection whatsoever between MM and EU4.
General mutiplayer stuff
-The multiplayer will include hotjoin (Announcement)
-The multiplayer will include support for stand-alone servers (Announcement)
-A chat feature that's not from the eighties.
-"A new matchmaking server will also be created, where you'll be able to see on-going games and possibly join them on the fly (with hotjoin!), and we will also have support for "stand alone servers", which allows a computer to run, let’s say up to 5-10 games continuously, and letting the metaserver know it exists so people can join them as well." (Johan - Interview)