CCP recently spoke extensively about their ambitious plans for 2013, even talking about the upcoming Retribution 1.1 patch shipping out on February 12th. In this patch however is a new feature which apparently comes at high demand, a dueling system for pilots.
The new system will allow players to duke it out, uninterrupted by CONCORD. CCP Masterplan discusses it in more detail in the latest EVE Insider Dev Blog post – also discussing the more intricate restrictions around the system. To find out more, visit the game page.