So this is all I could find on the event. If there is more info on it else where I apologize for search fail.
Epic Play in X-Wing takes on all-new dimensions with the release of the Imperial Raider Expansion Pack, and this special World Championships side event is your chance to explore the Galactic Civil War on an entirely different scale. Coordinate your squad with your teammate and take your stand for either the Imperial Navy or Rebel Alliance. Prizes will be awarded to all members of the faction that wins the war of this overall event!
So prizes awarded to all members of the faction that wins. How is that gong to work. If 30 teams show up as empire and 10 show up as rebels? More details about this event would be greatly appreciated so that players can be more prepared. I don't want to show up and find out there is to many of a specific faction and can't play. Or bring 2 300 point builds for both factions when I didn't need to. Space is going to be limited for travel considering how long this event is. And I plan to play 3 or more different games.