Gamespot video:
http://www.gamespot.com/events/gamescom-2012/video.html?sid=6391927
new facts:
- Timespan is 1444 till late 18th century (start right after the battle of Varna (
http://en.wikipedia.org/wiki/Battle_of_Varna) probably.
- Reduced impact of spies but increased presence of diplomacy
- Technology system completely overhauled
- Islands of Denmark are linked by ice in the winter. Effects of this still unclear.
New trade system example (playing Venice):
Placed a merchant in Alexandria (trade route hub) so more trade (money) went over the route through Venice. Then placed a merchant in Venice on the trade route to take more money out of the trade route.
Trade centers have a certain region, the more provinces you have in that region the more influence you have in the trade center.
Placing a fleet in Crete (owned by Venice, part of the Alexandria trade region) and ordering it to patrol the trade route from Alexandria will give more influence and thus more money going your way.
Trade routes will change in importance over time. At the start most will go through the Mediterranean and the Silk route but when Portugal finds the way around Africa more and more trade will go through that way. The more the Americas get colonized, the more trade comes from the west etc.
Paradox Studio manager Johan Andersson Really wants to make a ck2 to eu4 savegame converter at the release but doesn't promise anything.
Probably missed a few things so go watch the video (you definitely missed the beautiful map if you didn't look!).
@Don_quigleone: You're right, my imagination went to fast