They have released a video which shows what it is about.
Paradox Interactive have sent out a Call to Arms to people who love their games and are asking them to recruit gamers and convert them in a community-building campaign.
They have also announced in-game rewards for people who can recruit their friends. It’s all part of their initiative to get as many gamers interested in Europa Universalis 4 before it hits the PC in Q3 2013.
They have also released a new trailer that shows this in detail. You can sign up at Call to Arms site here. The developers had written an exclusive journal here on GamingBolt, and it gives some more idea on the game.
Check out the video below.