In less than twenty-four hours, Valve reveals what the whole Friendship jazz was all about. A twist on the Spy vs Sniper update from last summer, the Soldier/Demoman dual(duel) update will be determined by the players. By tallying up the kill count of one class against the other, Valve will release the update to the winning class first. In addition there's going to be a secret weapon that will be available to the winning side. Pretty good stuff!

http://www.teamfortress.com/war/part1/index.htm