At the New York Comic Con, CCP announced they are planning another expansion. This expansion, is about one thing. PvP. Basically, you or your corporation, alliance, or other group of friends can join an NPC soverign, and fly under their flag. There will be 4, for the 4 races. If you want to fly with the Amarr flag, by story line default you will automatically be at war with anyone in Gallente. Now, if this does not interest you, there are agents you can use to gain rep and new items + cash, in return for not wanting to PvP constantly.
That is the brief description, I strongly recommend reading the full write up and MMORPG if you wish to know more.